US2449789A - Mechanical deciphering system - Google Patents

Description

Sept. 21, 1948.

A. H. REIBER 2,449,789

MECHANICAL DECIPHERING SYSTEM Filed July 29, 1943 3 Sheets-Sheet 1 INVENTOR ALBERT H. REIBER, DECEASED EMILY Y. REIBER, EXECUTRIX ave w Sept. 21, 1948. A. H. REIBER 2,449,789

, MECHANICAL DECIPHERING SYSTEM Filed July 29, 1943 :5 Sheets-Sheet 2 INVENTOR ALBERT H. REIBER, DECEASED EMILY Y. REIBER EXECUTRIX P 1948. A. H. REIBER 2,449,789

MECHANICAL DECIPHERING SYSTEM Filed July 29, 1945 5 Sheets-Sheet 3 FIG. 7

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INVENTOR ALBERT H.,REIBER, DECEASED EMILY Y. REIBER, EXECUTRIX Patented Sept. 21, 1948 Albert H. Reiber, deceased, late of Evanston, 111;, by Emily Y. Reiber, executrix, Evanston, 111., assignor to Teletype G-sa'poration, Chicago, 11]., a corporation of Delaware Application July 29, 1943, Serial No. 496,552

Ill-Claims. 1 This invention relates to printing telegraph systems and apparatus and particularly to a system and apparatus for the transmission and reception of secret or confidential telegraph messages.

Signalling systems are desirable for naval,-

military and civil purposes wherein it is required that messages be rendered unintelligible to persons unauthorized to receive them. surreptitious interception of messages may be accomplished, for example, in the case of wire communications by tapping signal wires, and in radio communication by means of receiving apparatuses tuned to the proper frequencies.

The principal object of the present invention is to provide simple, compact and reliable facilities in telegraph systems and apparatus for rendering messages unintelligible to unauthorized persons.

Another object of the invention is to provide a system and apparatus for precluding the unauthorized interception of intelligible messages by mechanical operation established in response to the respective control conditions.

A further object of the invention is. to provide enciphering and deciphering instrumentalities which are readily adaptable to commercially available printing telegraph apparatus.

In order to encipher messages by the present system and apparatus, the elements of the code combinations of the original, intelligible message are combined with the elements of code combinations provided by a key tape or other control mechanism. In such arrangement, opposite-conditions, that is, with one element of the original code combination marking and with the correspan-ding element of the key code combination spacing, produce a marking signal. Like conditions, however, with both elements marking or both elements spacing, produce spacing signals. This presumes, of course, that each of the elements of the respective code combinations are related to each other. That is, the No. 1 element of the original code combination is combined with the No. 1 element of the key code combination, and so forth. To take a specific illustration, let it be assumed that it is desired to encipher the character R which in the Baudot code is composed of spacing, marking, spacing, marking, and spacing conditions. Let it be further assumed that the key tape with which the particular encipherin-g operation is to be performed occupies a position whereat it is conditioned for producing the letter T combination which in the Baudot code is composed consecutively of marking, spacing, marking, spacing, and marking conditions. Under the assumed conditions, the enciphering operation would result in the production of an all marking or letters combination, since in this particular illustration opposite' conditions of all the related elements of RP and Y code combinations are provided. This will be readily apparent from the following chart wherein the letter M indicates a marking condition and the letter s indicates a spacing condition. I

OriginalSignalR" s M s KeySignelY" M- ;s M s: M;

EncipheredSignolLetters" .M 7M M M It is. understood that both the transmitting and receiving end of a telegraph line will be equipped with identical key tapes or other control mechanisms: which during message trans;- mission will occupy identical positions. During transmission the key tapes or other control mechanisms are advanced between characters to modify the key signal, but both tapes occupy the same corresponding position at all times. A station which receives .eneiphered signals is thus enabled to decipher the, unintelligible signals transmitted over the telegraph line by combining emciphered signals with key signals provided .by its key .tape or other control mechanism.

To illustrate adeciphering operation, the example given above in connection with the enciphering operation will be continued and it will be assumed that areeeiving station received the enciphered signal; namely, Letters. The Y" combination provided by the key tape or other control -:mechani-sm at. the receiving station can now be combined with the received Letters" combination to decipher the enciphered signal to thereby reproduce the original signal R," as clearly shown in the following chart:

Enciphered Signal Letters" M M M 'M. M Key Signal Y M S M S M Original Signal R S M S M S 3 embodying the deciphering device according to the present invention;

Fig. 2 is a sectional view Fig. 1;

Fig. 3 is a front elevational view, partly in section, taken on line 3-3 of Fig. 2;

Figs. 4, 5, and 6 are views illustrating the various operational positions of the deciphering de-' vice;

Fig. 7 is a plan view of the keyboard controlled enciphering device according to the present invention;

Fig. 8 is a sectional view taken on line 8-8 of Fig. '7; V i

Figs. 9, 10, and 11 are views illustrating the enciphering device in its various operational posi tions; and

Fig. 12 is an electrical taken on line 2-2 of circuit diagram of the telegraph system embodying the present invention.

' The deciphering mechanism according to the present invention is illustrated in. Figs. 1, 2 and 3 as applied to a type wheel printer of the type shown in copending application Serial No. 397,193, filed June 9, 1941, by 'W. J. Zenner. The printer framework is indicated at II and comprises side frames I2 and I3. Mounted on side frames I2 and I3 are journal brackets I4 and I which support the main camshaft I6. Also spanning the frames I2 and I3 is a cross bar ll. A plate I 8 also spans the side frames I2 and i3 and carries a series of five electromagnets I9,

2I, 22, and 23, which constitutes part of the deciphering mechanism according to the present invention. Journaled in the side frames I2 and I3 and extending therebetween is a pivot shaft 24. Pivotally carried on the pivot shaft 24 substantially midway between the frames I2 and I3, is a printing arm 25 which carries at its extremity (the left end, asviewed in Fig. 2) a platen member 26.

Platen 26 cooperates with a type segment 21 fixed toa type wheel shaft 28 journaled in'a bearing 29 mounted in plate 30 which spans the frames I2 and I3. The right-hand end of the typewheel shaft 28 is carried in a bearing 32 mounted on abracket 3| fixed to the plate 30. The type segment 21 is provided with four rows of type faces, and a shift mechanism'is exemplified by a plurality'of stop bars- 33, provided for controlling the shifting movement of the type segment 2! to effect printing from the various rows of type. The bracket 34 is provided for guiding and supporting the tape between the platen 26 and the type segment 2l. A spring 35 normally biases the type or printing 'arm 25 downwardly to hold the platen 26 free from the type segment 21. The'printing operation is effectuated through the instrumentality of the vertical link 36 extending between the printing arm 25 and a printing cam (not shown) carried on the main shaft I6. Carried in brackets 3! and 38 mounted on bar I1 is a pivot shaft 39 on which are pivotally carried a series of selector levers M to 45. Each of the levers with a cam follower projection 46 which cooperates with the periphery of an associated selector cam 41. There are five such cams 41, one associated with each of the five selector levers Al to 45. The cams 4! are of similar cam contour but are displaced on the shaft I6 angularly sothat the cam projections 48are disposed in a helically arranged series whereby coaction with the cam followers 46 will occur in a sequential manner as the seriesv of cams 41 rotates in synchronism M to is provided with the speed of code impulsing. The levers (H to 45 are normally biased in a clockwise direction about the pivot shaft 39 by individual springs 49.

Each of the levers M to 45 extends leftwardly (as viewed in Fig. 2) and carries a vertically projecting portion 5|. The extremities 52 of the levers 4| to 45 cooperate with ashoulder 53 on an associated selector bar 54. Bars 54 are disposed vertically in the printer mechanism and are mounted on a shaft 55. Each of the bars 54 is provided with a slotted hole 56 cooperating with the shaft so that an individual spring 51 associated with each of bars 54 tends to hold the bar 54 in its vertical position against the bottom of the slot 56. The vertical bars 54 are provided with a, series of notches on one edge thereof and cooperate with a plurality of function bars 53 in the manner described in said co- .pending Zenner application.

Positioned above the series of portions or lugs El and cooperative therewith in a manner which will presently appear, is a corresponding series of pairs of depending levers GI. and 52 pivotally carried on a shaft 63 suitably journaled above the printer frame. Lever arms GI and 62 are normally biased toward each other by a common spring 64 extending therebetween. A bar 65 is provided to limit the movement of levers GI and 62 under certain operating conditions. Levers BI and 52 are also provided with confronting pro jections 6B and 61, respectively. Operatively positioned between the projections 68 and 61 is the laterally disposed extremity 68 of the depending arm of a bell crank lever 69, also pivotally carried on the shaft 63. Also operatively positioned between the projections 66 andBI is the laterally extending end or extremity II of an armature I2 of an electromagnet I3. The armature 72. is normally biasedin a clockwise direction about pivot ID by a spring I4. The magnet I3 is a single line magnet which responds successively to the code signal impulses. The lateral projection II of the armaturei2 spans the entire series of pairs of levers GI and 62. However. there is one bell crank lever 69 for each of the pairs of levers GI and 62, and associated with each bell crank lever 69 and operable upon the horizontal arm thereof is one of a series of magnets I9 to 23 (the magnet 2| being shown in Fig. 2). The magnet 2! is provided with an armature I5, pivoted at E5, which carries at its extremity an adjustable screw 11 to govern the movement of the bellcrank 69. Armature 15 is normally biased counterclockwise about its pivot I6 by a spring i8 extending between the armature I5 and a plate I9. The plate i9 carries therein-a series of adjustable stop pins 8|, one for each armature 15.

General operation In the operation of the apparatus according to the present invention, it is assumed that the normal stop current onpthe line 82 is marking, in which condition the armature I2 will be seized, and the shaft IE will be blocked against movement, in well-known manner in start-stop operation. The electromagnets I9 to 23 are energized in ccordance with the code combinations sensed in the key tape. Upon receipt of the start impulse, which is a no-current impulse, the magnet I3 will be de-energized, thus releasing armature I2 to respond to the pull of the spring I4. This action initiates the rotation of the shaft I6 in a well-known manner. The cams 41 will then sequentially allow. the levers II to 45 to respond to the pull of their respective springs 49'unless said levers are blocked through the coa-ction of lugs and lever arms 6| or 62. Assuming that the lever arm 43 is not blocked, it, will fall into the depression in its respective cam and be caused to rotate slightly in a clockwise direction. If the lug 5| is not obstructed by a lever 6| or 62 when the lever 43 engages a cam notch 48, the lever 43 will be rotated clockwise to bring the end 52 thereof out of the arcuate path of shoulder 53 to permit the spring 51 to rotate the lever 54 to bring the shoulder 53 under the extremity 52. Then, when the cam 41 rotates further to urge the lever 43 counterclockwise, the lever 54 will be depressed against the action of its spring 51 due to the slotted hole 56. Under certain conditons of operation in response to predetermined code signals, certain of the bars 54 will function to operate certain of the stop bars 33 to control the shift movement of the type wheel 21 to cause printin in a selected one of the four rows of types. This specific mechanism is further described in said copending Zenner application.

Of course, if the projection 5| is blocked by one or the other of the levers BI and 62 no clockwise rotation of the levers 4| to 45 will occur, and hence, the bars 54 associated therewith will not be operated downwardly. The cam assembly on shaft It also includes a cam 83 which acts upon bell crank lever 84, pivoted to the frame at 85, to cause a bail member 86 to act upon all of .the levers 54 to return them leftwardly to their normal unlatched position (as shown), thus disengaging those members 54 which were previously engaged by the end 52 and permitting them to i be returned by their springs 51 to their upward normal position with the shaft 55 at the bottom of the slot 56.

In the operation of the deciphering arrangement according to the present invention, the levers 6| and 62 are controlled jointly by the selector magnet 13 and by the deciphering magnets |9 to 23, inclusive. Having reference to Fig. 2, when the signal impulse received by the selector magnet 13 is of marking nature the magnet 13 will be energized and the armature 12 will beattracted, or moved to its counterclockwise position,

to bring its laterally projecting or extending and 1| in the rightward position, as shown in Fig. 2, to actuate the lever arm 62 counterclockwise to bring its lower extremity out of register with the projection 5|. Under normal conditions of'operation the lever 43 would vbe free to rotate clockwise upon the rotation of cam 41 to bring the extremity 52 over the shoulder 53 of the bar 54. However, under the control of the deciphering arrangement according to the invention, the movement of levers 4| to 45 will be further governed by the deciphering device, exemplified by magnets I9 to 23. In the position shown in Fig. 2, the deciphering magnet 2| is shown energized under the control of its key tape, in which condition the armature is attracted, to rotate the lever 69 counterclockwise to bring its laterally disposed end 68 to its rightward position, thus permitting the spring 64 to bias the arm 6| counterclockwise to bring the lower extremity thereof into registry with the vertical lug 5|. Thus, when the cam 41 rotates to the position where notch 48 is in register with cam follower 46, thus to permit the lever 43 to rotate counterclockwise, such rotation will be prevented by the impingement of lug 5| against lever 6| under the control of the deciphering magnet 2|.

In Fig. 6, another condition of operation is ileLU lustrated wherein the selector magnet 13 is. energized by marking current on the line, and the deciphering magnet 2| is shown de-energized. In this condition of operation the energ-ization of magnet 13 will, through the lateral portion 1| of armature 12, cause the arm 62 to be rotated counterclockwise to bring its lower extremity out of the registry with the vertical lug 5| of the lever 43. Also, the de-energization of the electromagnet 2| will permit the armature 15 to respond to the pull of spring 18 so that the lever 69 will be rotated clockwise about its pivot 63 to cause .lts lateral portion 68 to actuate the lever arm 6 l'leftwardly or clockwise against the action of spring 64 so that the lug 5| of lever 43 is not blocked, which will permit follower 46 of lever 43 to fall into the notch 48 of the cam 41, thus permitting the end 52 of lever 43- to engage the shoulder 53 of lever 54, whereby, upon further rotation of the cam 41, the bar 54 will be urged downwardly. Thus it is seen that the normal action of the lever 43 un-v der the control of selector magnet 13 is altered by the presence of the deciphering magnet.

In Fig. 4 is shown a further condition of operation wherein the selector magnet 13 is de-energized due to spacing current on the line, and the deciphering magnet 2| is energized. In accordance wit-h this condition, the lever arm 62 will be actuated rightwardly or counter-clockwise by the end 68 of the lever -69 under the control of the de ciphering magnet 2| instead of by the end 1| of the armature 12 as was the case in Fig. 6. On the other hand, the lever 'arm 6| is operated simialr to the manner shown in Fig. 6 except that such operation has been effected by the armature 12 of the selector magnet 13 instead of by the lever :69, as was the case in Fig. 6. Under this conditioner operation, spacing current on the signal line and marking current on the winding of the deciphering magnet 2| will cause the arms 6| and 62 to assume the position shown in Fig. 4 to permit the operation of the lever 43 and the consequent 010- eration of the lever arm 54.

In the position shown in Fig. 5, the magnet 13 is shown tie-energized in response to a spacing signal, and the deciphering magnet 2| is also shown dc-energized. In this condition of operation, the lever arm '6 is held in a clockwise position by both the armature 12 and the lever 69, and accordingly the spring 64' acts to rot-ate the lever 63 clockwise against the limit stop '65 to bring the lower extremity of arm 62 into vertical registration with the projection 5| on lever 43 thus preventing the lever 43 from rotating clockwise when the follower 4-6 registers with the depression in the cam 41. With the mechanism just described it is seen that when the selector magnet 13 and de ciphering magnet 2| assume the same condition, namely, both marking or both spacing, the lever 43 operates as it would in response to a spacing signal if it were solely under the control of the selector magnet 13. On the other hand, if the select-or magnet 13 and deciphering magnet 2| are operated in opposite manner to each other, the lever 43 responds as it would for a marking signal if it were solely under the control of the selector magnet 13, which condition agrees with the table presented hereinbefor-e.

Transmitter In Figs. 7 to 11, inclusive, is shown a transmitter which is keyboard operated and which transmits to the receiving device, described above, enciphered signals which, as shown previously are .deciphered-by the mechanism shown in Figs. 1 to 6, inclusive. Briefly, upon the operation of a key lever to transmit a character over the signal line, the signal actually represented by the key lever will not be transmitted, but such signal will be altered or changed 'by an enciphering arrangement which is similar in principle to the deciphering arrangement described hereinbefore.

The keyboard mechanism comprises :a base portion IIII (Fig. 8) which carries therein a series of key levers I92. As is customary in such keyboards, the key levers I82 are pivotally mounted at the rear of the apparatus-or base and are spring urged into their horizontal positions so that, when they are depressed, they will shift a series of five selector bars I03. The'keyboard shown herein is of the type disclosed in U. S. Patent No. 1,595,472, issued August 10, 1926, to H. L. Krum. As a key lever I82 is depressed it acts upon the saw-toothed cam lugs I84 to shift the code bars I93 rightwardly or leftwardly, the code bars being slidably mounted on bearings I85.

Each of the code bars I83 is provided with a pair of studs I88 between which operates the depending arm of a lever III'I pivotally mounted on a pivot shaft I88 journaled in the bracket 'I 99. The upper or vertically extending arm of lever I8! is provided with a laterally directed extremity III. Also mounted on the pivot shaft I88 and individual to each lever I01 is a pair of vertically extending arms I I2 and I I3 between which the laterally extending extremity III .of lever I 01 cooperates. Associated with each of the pairs of levers I I2 and H3 is a bell crank lever I I4 which is pivoted on the pivot shaft I08. Thus, for each code bar I83 there is provided an assemblage of levers ID'I, II2, I I3, and H4. The levers H2 and H3 are norm-ally urged toward each other by a common spring H5. The bell crank H4 is provided with a vertically extending arm having a laterally directed extremity '6 which cooperates with the confronting edges of the arms H2 and H3. Lever I I4 is normally biased in a counterclockwise direction about the piv-ot shaft I88 by an individual spring I IT. The extremities of the horizontal arms of the bell crank levers I'I4 cooperate with plungers II B of a series of solenoids I2I to I25, inclusive, of which there are five in number corresponding to the five bell crank levers II I. The solenoids I25 to I25. inclusive, are suitably mounted on mounting plates carried on .posts I26 secured to the base I8I. Up-stops I'2I are provided for each of the solenoids to govern the movement of the plungers I I3.

Each of the arms H2 and H3 is provided near its upper extremity with a shoulder I28. Cooperating with the pair of shoulders I28 is the laterally directed extremity I29 of a series of goose neck shape-d contact levers 'I-3I pivot-ally mounted on a pivot shaft I32 carried in the bracket I89. Each of the levers I3I is provided with a cam follower projection I33 on its horizontal arm which coacts with a transmitting cam I34 of which there are five in number in the present instance. These cams I34 are fixed to the transmitting shaft I35 which has associated therewith a tooth-ed or grab clutch (not shown) which is a single revolution clutch, as is well known in the art. Each of the cams I34 is provided with a cam notch I36. As disclosed in the afore-mentioned U. 18. Patent No. 1,595,472 the cams I34 are so disposed on the shaft I35 that their cam notches I36 are arranged in a helical series so that the levers I3I are operated sequentially. Associated with each of the levers I3I is a contact I31 which is normally open. As described in said patent a sixth cam I38 (Fig.

'7) is provided, the contact lever I39 of which is so. related with the cam that its contact corresponding to contact I3! is normally closed in the stop position, thus maintaining a marking condition on the Signal line to which the contacts I31 are connected. Said cam I38 is known as the start-stop cam.

Also fixed to the cam shaft I35 is a locking bail cam I4I. Cooperating with the periphery of the cam MI is a follower roller I42 carried on an arm of the locking bail I43 which is pivoted at I44 to the frame I89. The bail I43 cooperates with the pointed extremities of the arms H2 and H3 to lock them in one or the other of the selected positions, as more clearly shown in Figs. 8, 9, 10, and 11.

In the operation of the transmitting mechanism shown in Figs. '7 to 11, inclusive, it is assumed that a key lever has been operated, which has moved the code bar I83 to its rightward position, as shown in Fig.8, whereby the lever I8! is rotated to its counterclockwise position, thus causing its lateral projection III to actuate the arm II2 to its leftward or counterclockwise position thereby bringing its shoulder I28 out of the path of the lateral portion I29 of the contact lever I3I. Thus, it is observed that the shoulder I28 of arm II2 does not during this condition of operation block the movement of the contact lever I3I to close its contact I 31. However, this movement of the contact lever I3I may or may not be blocked by the companion shoulder I28 of the arm II3. In Fig. 8 the shoulder I28 of the arm H3 is shown out of the path of the portion I29 whereby the contact lever I3I is free to close its contact I31 when the cam notch I 36 passes over the follower I33.

In the condition of operation in Fig. 8, the bell crank I I4 of theencipherin device is shown inv its clockwise position with its lateral portion II6 acting to urge the arm II3 to its clockwise position against the action of spring II5 to bring theshoulder I28 thereon out of operative relation or engagement with the lateral portion I29 of the contact lever I3I. Thus, it is observed that the signal impulse transmitted over the line through the contact I3! is of marking nature.

In. the condition of operation shown in Fig. 9, the code bar I83 is still shown in its rightward position, thus holding the arm II2 out of the path of the projection I29 of the lever I3I'. However the enciphering solenoid I25 is shown in its de-energized condition with the plunger IIBreleased to permit the spring II! to rotate its associated lever I I4 counterclockwise to permit the spring II5 tojbring the shoulder I28 of the arm Ii3 over the projection I29 of the lever I3I, thus blocking the counterclockwise rotation of the lever I3I and precluding the closure of the associated' contact I31.

In Fig. 10, the code bar I83 is shown in its leftward position having been operated thereto by a key lever I82. In response to this movement of the'code bar I83 its associated lever III! has been actuated clockwise to the position shown in Fig. 10 whereat the lateral projection III has moved the arm H3 to its rightward or clockwise positionto bring the shoulder I28 thereon again out of the path of the projection I29 of the lever I3I. The lever I I4 is still shown in its counterclockwise position due to the fact that the enciphering solemold is still de-energized. The spring III causes lever II4 to follow plunger II8 to bring the lateral portion II6 against the arm II2 thus urging the arm II2 to its counterclockwise position,

. bringing the shoulder I28 thereon out of the path 9 of the projection I29 of the lever -I3'I. 'In this condition the goose neck lever is free to res-pond to the notch I36 in the cam [34 to effect the closing of its associated contact I31.

In Fig. 11 the code bar I03 is still shown in its leftward position thus holding the .arm I07 in its clockwise position so that lever arm I I3 is held in its clockwise position to maintain the shoulder I28 thereon out of the path-of the projection I29 Electrical circuit In Fig. 12 is shown an electrical circuit embracing the structures of the present invention. In the rectangle II is shown the transmitting contacts I31 associated with the rotary cam distributor, and the contacts I52 which are controlled by a key tape I53 or other control mechanism. It is noted that each of the contacts I52 is connected to a solenoid IE! to I25, and that the contacts I31 are included in a circuit extending from ground, through battery, then through the contacts I31 sequentially, then over the line 82, and through the winding of the selector magnet 13 to ground.

The magnet I3 is shown as included in a receiving station indicated by the rectangle I I5 I, and the lever arms SI and 62 are shown diagrammattically. Also shown associated with the levers 6| and 62 are the electromagnets I9 to 23, inclusive. Magnets I 9 to 23 are included in a circuit extending from a common ground wire to their respective contacts I62 governed by tape controlled levers I63, thence to grounded battery.

As previously mentioned, identical key tapes I 53 and I64 are provided at the transmitting and receiving stations I5I and IEI, respectively. It is understood that these identical key tapes are placed in their respective tape transmitters in identical positions so that in the operation of the machine the standard tape transmitter contacts I31 and the selector magnet I3 shall have their selective operations altered in a similar manner,

Although a specific embodiment of the invention has been disclosed, it is understood that the invention is not to be restricted to the structure herein described but is to be given an interpretation determined by the scope of the appended claims.

What is claimed is:

1. In combination, means for sensing the coded record of a tape perforated accordin to a predetermined plan, a device for deciphering telegraphic messages electrically connected to said means, said device comprising signal controlled means responsive to received telegraph signals, a plurality of cams rotated in timed relation with the receipt of signals by said signal controlled means, a corresponding plurality of cam followers, a plurality of pairs of levers, one pair associated with each cam follower, a series of magnets connected to said sensing means for determining the positionment of said levers, one of said magnets associated with each pair of levers, means controlled by said signal controlled means for also governing the positionment of said levers, and

means actuated by said cam .fo'llowers under the combined influence of .said tape sensing means and said signal controlled means to control printer functions.

2. In asecret code receiver, an element moved according to an encipher-ed signal, :a plurality of pairs of members settable in permuted position according to a deciphering code, means, comprising instrumentalities for setting said members, and means to-deciphe-r an enciphered signal, said means controlled by the mechanical interaction of said element and said instrumentalities with .said pairs of members.

3. In .a telegraph system, a receiving station including printing means, a signal line connected to said station, selector mechanism in said receiving station responsive to received eenciphered signals, said selector mechanism comprising a series of pairsof levers, and tape controlled-means tor controlling said pairs of said levers in apredetermined manner to decipher said received enciphered signals to control said printing means in accordance with the deciphered code signal.

4. In combination, receiving apparatus including printing means, selector mechanism in said apparatus responsive to enciphered signals received from a transmitting station, said selector mechanism comprising a series of pairs of blocking levers, synchronized cam means, a plurality of levers operatively related to said cam means, one associated with each pair of blocking levers, a plurality of selectable bars, one oooperable with each lever of said plurality of levers, and tape controlled means effective in conjunction with said selector mechanism to control said blocking levers to decipher said signals to effectuate, through said plurality of levers, the operation of said bars.

5. In combination, signal controlled means, tape controlled means, cam controlled selecting means, and a pair of blocking instrumentalities controlled jointly by said signal controlled means and said tape controlled .means for controlling said selecting means to alter the signal received by said signal controlled means to effect an operation under the control of said selecting means in accordance with said altered signal.

6. In a deciphering device for telegraph printers, signal controlled means, an element moved according to the operation of said signal controlled means, tape controlled means, a series of elements set in permuted position according to the operation of said tape controlled means, a plurality of pairs of instrumentalities governed dually by said element and said series of elements, a set of selectable bars, cam actuated selecting means tending to select and operate said bars sequentially, and means controlled by said pairs of instrumentalities to determine the bars to be selected and operated.

'7. In a telegraph system, a receiving station, a signal line connected to said station, tape controlled means at said station, means at said receiving station to receive enciphered signals comprising an element moved according to the nature of the received signals, a series of elements set in permuted position according to the operation of said tape controlled means, a plurality of pairs of instrumentalities governed dually by said element and said series of elements, a set of selectable bars, cam actuated selecting means tending to select and operate said bars sequentially, and means controlled by said pairs of instrumentalities to determine the bars to be selected and operated.

8. In a printer apparatus, signal responsive means, locally controlled means, a plurality of pairs of blocking elements dually controlled by said signal controlled means and said locally controlled means, cam means, members controlled by said cam means under the supervision of said pairs of blocking elements, and a plurality of bars selectively operated by said members to perform printer functions.

9. In a recorder, a plurality of pairs of blocking elements, signal responsive means for exercising a predetermined control over said pairs of blocking elements, other means for variously controlling said pairs of blocking elements, cam means,

' members controlled by said cam means under the supervision of said pairs of blocking elements, and a plurality of instrumentalities selectively operated by said members.

10. In combination, signal controlled means I responsive to incoming signals, signal controlled deciphering means responsive to deciphering sigl2 nals, cam controlled selecting means, and a plurality of pairs of controllers controlled jointly by said signal controlled means and said signal controlled deciphering means for controlling said selecting means to alter the signal received by said signal controlled means to effect an operation under the control of said selecting means in accordance with said altered signal. I

EMILY Y. REIBER,

E'mecutrix, Under the Last Will and Testament of Albert H. Reiber,Deceased. I

REFERENCES CITED The following references are of record in the file of this patent:

V UNITED STATES PATENTS Number Name Date 1,310,719 Vernham July 22, 1919 20 1,872,951 Hitt Aug. 23, 1932 Hagelin Feb. 12, 1946

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