[go: up one dir, main page]

US2062453A - Game and educational device - Google Patents

Game and educational device Download PDF

Info

Publication number
US2062453A
US2062453A US718768A US71876834A US2062453A US 2062453 A US2062453 A US 2062453A US 718768 A US718768 A US 718768A US 71876834 A US71876834 A US 71876834A US 2062453 A US2062453 A US 2062453A
Authority
US
United States
Prior art keywords
strip
contacts
spool
series
pairs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US718768A
Inventor
Hastings Whitney
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US718768A priority Critical patent/US2062453A/en
Application granted granted Critical
Publication of US2062453A publication Critical patent/US2062453A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B7/00Electrically-operated teaching apparatus or devices working with questions and answers
    • G09B7/06Electrically-operated teaching apparatus or devices working with questions and answers of the multiple-choice answer-type, i.e. where a given question is provided with a series of answers and a choice has to be made from the answers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/18Mechanical movements
    • Y10T74/18056Rotary to or from reciprocating or oscillating
    • Y10T74/18144Overcoming dead center

Definitions

  • a roll of paper or other suitable exible material is provided with a series of pictures of prominent people
  • the portion of the roll in which the apertures are formed passes between the contacts of a. plurality of electric push buttons or ythe like, the number of push buttons being the same as the number of titles opposite each picture. If the push button opposite the correct title is pushed, it will make' contact through the aperture in the roll and will cause a visible or audible signal to.be operated. If abutton opposite any of the incorrect titles is pushed, it will not make electrical contact by reason of an imperforate portion of the roll being between the contacts of the button.
  • Fig. l is a top view of a preferred embodiment of my invention.
  • Fig. 2 is a top view of the device with the top of the box removed;
  • Fig. 3 is a cross-sectional view taken on the line 3-3 of Fig. 2;
  • Fig. 4 is a view of a portion of the device shown in Figs. 1 through 3;
  • Fig. 5 is an elevational view of one of the members employed in my invention.
  • Fig. 6 is a cross-sectional View taken on the line t-s of Fig. 2.
  • reference character I il designates a box-like structure, the top 9 of which is removable and may be ornamentally designed in some such manner as shown in Fig. 1.
  • Fig. 1 there is a picture of an owl, the eyes of which are formed by electric bulbs II.
  • the owl the top of the box is formed with an opening l2 which, if desired, may be covered with glass or other transparent material.
  • vOpposite the opening there is located an electric circuit closing device, to be explained hereinafter.
  • the bottom of the box is provided with a reinforcing member I4, upon which are adapted to be mounted spaced reels or spools I5. As shown,
  • Brackets I6 and I1 of resilient material are secured to members I4, as by screws I8.
  • Bracket IB has a hole punched therethrough and the material upset to form a cylindrical, horizontally extending projection I9.
  • Bracket I1 ⁇ has a hole 20 formed therein which, when the brackets are mounted, is in alignment with projection I9.
  • Spools I5 include a hub portion 2
  • a table or supporting member 3l which is situated beneath the opening I2 in the top of the box.
  • a member 33 Secured to' one end of member 3
  • Mountedbelow member 33 is a metallic conducting member 34 having a plurality of fingers 35. Each of these fingers is provided with a button 36 which extends lthrough an opening in the member 33. Fingers 35 are resilient so that they may be forced down by pushing on the button and will spring back when the pressure is relieved.
  • are located corresponding xed contact members, or if desired, one contact strip 31, extending under all of place within a. frame 39.
  • 'I'hese batteries are included in an electrical circuit comprising the electric bulbs II and the circuit Iclosing device including member 34 and strip 31, winch latter are equivalent to four push buttons connected in parallel in the circuit, and the circuit may be4 closed this edge of the strip is adapted to the contacts.
  • the spool I5 upon which is wound y by establishing contact through any nger 35 and strip 31.
  • bulbs II are connected in series, but obviously they may be connected in parallel if desired.
  • the strip of.' paper 'or other suitable flexible material v3l! is wound on one of the spools I5, passes over the table member 3
  • the strip of flexible material 30 is provided with a series of pictures or other visual representations 40.
  • each picture 40 is a plurality of titles or other visual representations 4 I.
  • the number of titles isthe same as the a number of buttons 36.
  • Associatedwith each title is a line 42 formed on the strip, which is adapted to be lined up with an arrow 43 opposite each button. Obviously, only one line vand one arrow could be used.
  • One of the titles is the correct one for the picture with which it is associated, while the others are incorrect. Opposite the correct'.
  • the strip of flexible material 30 is placed in the device by removing the top of theA box and withdrawing one of the spindles 25..
  • the spool is then placed between the brackets I6 and II and the pass between spindle is inserted through the openings 26 and ⁇ 2
  • the end oi the strip is then led over the table member 3
  • the strip is then secured to the other spool as by inserting the end of the strip in the slot 29 formed in the hub 2
  • the top of the box may thenbe replaced, and the game is ready to be played.
  • the spindle 25 associated with the spool I5 to which the end of the strip has been secured is then turned ⁇ until the first picture 40 on the strip Aappears in the opening I2,.and the lines 42 are aligned with the arrows 43.
  • the player then pushes the button 36 opposite the title which he picture appears in the opening I2.
  • the vselection of a button is then repeated.
  • 'I'he stripy is constructed so that the correct title appears in difierent order for the dierent pictures. For instance, the correct title for the first picture may be the third; the correct title for the 4second picture may be the first, and so on. Consequently, the player can never know .from the' construction of the device which is the correct button, but must rely -upon his knowledge of the subject matter shown on the strip.
  • strips 30 may be formed with other than pictures and titles.
  • the strips 30 may be formed with other than pictures and titles.
  • the strips 30 may be formed with other than pictures and titles.
  • each set having a subject matter relation'to the first mentioned visual rep-- resentation with which it is associated.
  • an electric circuit means for closing said circuit including a plurality of pairs of electric contacts, a member havingthereon a pictureI and a plurality of titles associated with said picture, said member beingY between said pairs of contacts with said apertures in alignment with the contacts.
  • an electric circuit means yfor closing said circuit including a plurality of pairs of electric contacts, a pair of rotatable members located on either side of said ⁇ means, a flexible member adapted to be rolled from one of said members to the other, said flexible member having thereon aseriesof visual representations and a set of visual representations associated with each of the representations in said series, said flexiblel member being formed 40 with an aperture located in the same relative position in relation to one representation in each set, and means for guiding said flexible member between said pairs of contacts with said alignment with the contacts.
  • a supporting member an electric circuit, means for closing said circuit including a plurality of pairs of electric contacts carried by said member, a
  • a ilexible member adapted to be rolled from one of said rotatable members to the other and to pass over said supporting member, said flexible member having thereon a series of. visual representations and a 55 set of visual representations associated with each of the representations in said series, said ilexible member being formed with an aperture located in the same relative position in relation to oneV representation inl each set, said contact devices '60 being so positionedI with respect to said flexible member that the latter passes between the pairs of contacts with said apertures in alignment therewith.
  • a supu porting member an electric circuit, means for closing said circuit including a pluralityv of pairs of electric contacts carried by said member, a pair of spools, means for rotatably and removably mounting said spools on either side of said 7 supporting member, and a flexible member adapted to be rolled from one of .said spools tothe other and to pass over s'aid supporting member, said flexible member having thereon a series o! formed with an aperture located opposite one ,said titles, and means for guiding said member a ertures in lqvisualrepresentations and a set of visual representations associated.
  • an electric circuit means for closing said circuit including a .plurality of pairs 'of .electric contacts, l -a member of insulating material'having thereon a series of visual representations and a set of representations associated with each of the representations in said series, said member being formed with a non-insulating area opposite one representation'in each set, and means for guiding ber, and a exible member adapted'tobe rolled. l pa h.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Physics & Mathematics (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Toys (AREA)

Description

De. 1, 1936. w, HAs'nNGs l 2,062,453
GAME AND EDUCATIONAL DEVICE Filed April 3, 1934 2 Sheets-Sheet l A HoLLYwooo STAR JANE MARY
Dec. 1, 1936. w HAS-'UNSS' 2,062,453
GAME AND EDUCATIONAL DEVI CE Filed April' 3, 1934 2 Sheets-Sheet 2 l lI l l l l g I s Patented Dec. 1, 1936 UNITED. STATES PATENT oFFl'cE GAME AND EDUCATIONAL DEVICE Whitney Hastings, Middletown, Gunn.
Application April 3, 1934, Serial No. 718,768
`S Claims.
In accordance with my invention, a roll of paper or other suitable exible material is provided with a series of pictures of prominent people,
- frbuildings or the like, and opposite each picture appears a plurality of titles, one of which is correct. This roll is arranged to bemoved underneath an opening in a box-like structure so that one picture is visible at a time. Opposite the correct title, but out of sight through the opening in the box, the roll is provided with an aperture. i
The portion of the roll in which the apertures are formed passes between the contacts of a. plurality of electric push buttons or ythe like, the number of push buttons being the same as the number of titles opposite each picture. If the push button opposite the correct title is pushed, it will make' contact through the aperture in the roll and will cause a visible or audible signal to.be operated. If abutton opposite any of the incorrect titles is pushed, it will not make electrical contact by reason of an imperforate portion of the roll being between the contacts of the button.
Further objects and advantages of my inven tion will be apparent from the following description considered in connection with the accompanying drawings which form a part of this speciflcation and onwhich: I
Fig. l is a top view of a preferred embodiment of my invention;
Fig. 2 is a top view of the device with the top of the box removed;
Fig. 3 is a cross-sectional view taken on the line 3-3 of Fig. 2;
Fig. 4 is a view of a portion of the device shown in Figs. 1 through 3;
Fig. 5 is an elevational view of one of the members employed in my invention; and
Fig. 6 is a cross-sectional View taken on the line t-s of Fig. 2.
Referring to the drawings, reference character I il designates a box-like structure, the top 9 of which is removable and may be ornamentally designed in some such manner as shown in Fig. 1. As shown, there is a picture of an owl, the eyes of which are formed by electric bulbs II. Opposite the owl the top of the box is formed with an opening l2 which, if desired, may be covered with glass or other transparent material. vOpposite the opening there is located an electric circuit closing device, to be explained hereinafter.-
The bottom of the box is provided with a reinforcing member I4, upon which are adapted to be mounted spaced reels or spools I5. As shown,
brackets I6 and I1 of resilient material are secured to members I4, as by screws I8. Bracket IB has a hole punched therethrough and the material upset to form a cylindrical, horizontally extending projection I9. Bracket I1`has a hole 20 formed therein which, when the brackets are mounted, is in alignment with projection I9.
Spools I5 include a hub portion 2| to each end of which is secured a disc 22. Each end of hub 2i is bored out for at least a short distance to form cylindrical recesses 23. A washer 24 having a square or rectangular hole therethrough is driven part way into the bore at one end, or such washers may be driven into both bores so that the spool may be reversed. A spindle 25 is adapted' tol be passed through an opening 26 formed in the side of box Ill in alignment with hole 20. Resilient brackets I6 and I1 may be spread apart sumciently to allow the placing of spool I5 therebetween `with projection I9 extending into the bore 23 and rotatably supporting that end of the spool. Spindle 25 is then inserted through hole' 204 in bracket I1 and into bore 23. The end 21 of the spindle is formed squarelor rectangular in cross-section and is `adapted to pass through the similarly formed hole in washer 24, whereby rotation of spindle causes rotation of the spool. Resilient brackets I6 and I1 bear against the ends of the spool sumciently to prevent undesired rotation of the spool. 'I'he outer end of spindle 25 is provided with a knob 28 to facilitate turning by hand. Hub 2I is formed with a slot 29 to receive 'and engage one end of a strip 30 of paper or other suitable iiexible material which is adapted to be wound on the spool.
Between the spools there is located a table or supporting member 3l which is situated beneath the opening I2 in the top of the box. Secured to' one end of member 3| by means of screws 32 is a member 33, the left hand portionl of which as viewed in Fig. 6, is spaced slightly above the top surface of member 3I. Mountedbelow member 33 is a metallic conducting member 34 having a plurality of fingers 35. Each of these fingers is provided with a button 36 which extends lthrough an opening in the member 33. Fingers 35 are resilient so that they may be forced down by pushing on the button and will spring back when the pressure is relieved. Directly underneath contact iingers 35 on the table member 3| are located corresponding xed contact members, or if desired, one contact strip 31, extending under all of place within a. frame 39. 'I'hese batteries are included in an electrical circuit comprising the electric bulbs II and the circuit Iclosing device including member 34 and strip 31, winch latter are equivalent to four push buttons connected in parallel in the circuit, and the circuit may be4 closed this edge of the strip is adapted to the contacts.
In operation, the spool I5 upon which is wound y by establishing contact through any nger 35 and strip 31. As shown, bulbs II are connected in series, but obviously they may be connected in parallel if desired. l
The strip of.' paper 'or other suitable flexible material v3l! is wound on one of the spools I5, passes over the table member 3| and engages the other spool I5, so that, by turning one of the knobs 28, the strip will be wound from one spool to the other in much the same manner as a filmI in a camera. The strip of flexible material 30 is provided with a series of pictures or other visual representations 40. Opposite each picture 40 is a plurality of titles or other visual representations 4 I. The number of titles isthe same as the a number of buttons 36. Associatedwith each title is a line 42 formed on the strip, which is adapted to be lined up with an arrow 43 opposite each button. Obviously, only one line vand one arrow could be used. One of the titles is the correct one for the picture with which it is associated, while the others are incorrect. Opposite the correct'.
title the strip -is formed with an aperture 43 which is in alignment with the contact members, and
the strip of flexible material 30 is placed in the device by removing the top of theA box and withdrawing one of the spindles 25.. The spool is then placed between the brackets I6 and II and the pass between spindle is inserted through the openings 26 and `2|) and through the square opening in the washer 24. The end oi the strip is then led over the table member 3| with the right hand edge passing between the electric contacts. The strip is then secured to the other spool as by inserting the end of the strip in the slot 29 formed in the hub 2|.
The top of the box may thenbe replaced, and the game is ready to be played.
The spindle 25 associated with the spool I5 to which the end of the strip has been secured is then turned` until the first picture 40 on the strip Aappears in the opening I2,.and the lines 42 are aligned with the arrows 43. The player then pushes the button 36 opposite the title which he picture appears in the opening I2. The vselection of a button is then repeated. 'I'he stripy is constructed so that the correct title appears in difierent order for the dierent pictures. For instance, the correct title for the first picture may be the third; the correct title for the 4second picture may be the first, and so on. Consequently, the player can never know .from the' construction of the device which is the correct button, but must rely -upon his knowledge of the subject matter shown on the strip. y
Obviously the strips 30 may be formed with other than pictures and titles. For instance, the
one representation of each set having a subject matter relation'to the first mentioned visual rep-- resentation with which it is associated.
' [While I.have described one more .or less specinc embodiment of my invention, it is to be 15 understood that this is only for purposes of illustration, of the invention, and that the scope thereofis not to be limited thereby, but is to be resentations (shown in the drawings as titles 4I) 10 measured by the appended claims viewed in the 20 light of the prior art.
What I claim isf 1. In a device of the class described, an electric circuit, means for closing said circuit including a plurality of pairs of electric contacts, a member havingthereon a pictureI and a plurality of titles associated with said picture, said member beingY between said pairs of contacts with said apertures in alignment with the contacts.'
2; In adevice of the class described, an electric circuit, means yfor closing said circuit including a plurality of pairs of electric contacts, a pair of rotatable members located on either side of said` means, a flexible member adapted to be rolled from one of said members to the other, said flexible member having thereon aseriesof visual representations and a set of visual representations associated with each of the representations in said series, said flexiblel member being formed 40 with an aperture located in the same relative position in relation to one representation in each set, and means for guiding said flexible member between said pairs of contacts with said alignment with the contacts.
3. In a device of the class described, a supporting member, an electric circuit, means for closing said circuit including a plurality of pairs of electric contacts carried by said member, a
pair of rotatable members located on either side 50 of said supporting member, and a ilexible member adapted to be rolled from one of said rotatable members to the other and to pass over said supporting member, said flexible member having thereon a series of. visual representations and a 55 set of visual representations associated with each of the representations in said series, said ilexible member being formed with an aperture located in the same relative position in relation to oneV representation inl each set, said contact devices '60 being so positionedI with respect to said flexible member that the latter passes between the pairs of contacts with said apertures in alignment therewith.
4. In a device ofthe class described, a supu porting member, an electric circuit, means for closing said circuit including a pluralityv of pairs of electric contacts carried by said member, a pair of spools, means for rotatably and removably mounting said spools on either side of said 7 supporting member, and a flexible member adapted to be rolled from one of .said spools tothe other and to pass over s'aid supporting member, said flexible member having thereon a series o! formed with an aperture located opposite one ,said titles, and means for guiding said member a ertures in lqvisualrepresentations and a set of visual representations associated. with `each oi' therepresentations in` said series, said ilexible member'beinu 'formedwith an. opening therethrough, a supporting member mounted within said box-like -member beneath said opening, an electric circuit, means for closing said circuit includingpairsoi electric contacts carried by said supporting member and accessible through said opening, a pair of spools. means, including withdrawable spindles for rotatably and removably mounting saidspools 'on either side of said supporting member, said spindles extending to outside said box-like member having thereon a'series of lvisual representations and a set of visual representations -asso ciated with each of the representations in-said A series, said flexible -member being formed with an aperture located in the same relative positionl 30 in relation to one representation in eachset, said pairs of contacts being so positioned with respect tov said flexible member thai'I the` latter passes between the, pairs of contacts with said apertures in alignment therewith.
6. In e device er the class described, e'n electric circuit, means for closing said circuitincluding a plurality of pairs oi.' 'electric contacts, a member of insulating material having thereon a visual representation and a plurality oi.' visual .repre` sentations associated-fwithsaid rst mentioned E guiding said member between said pairs of concontaots..
I'7. In a device ofthe class described, an electric circuit, means for closing said circuit including a .plurality of pairs 'of .electric contacts, l -a member of insulating material'having thereon a series of visual representations and a set of representations associated with each of the representations in said series, said member being formed with a non-insulating area opposite one representation'in each set, and means for guiding ber, and a exible member adapted'tobe rolled. l pa h.
from one of said spools to the .other and to-pass sal-d member between'said s of contacts with over said supporting member, said `flexible memsaid areas'in alignment. with the contacts.
8. -As a new article lormanu'facture, v'aflexible v member` having thereon a series of visual rep- 10 .tacts with' Vsaid larea. in augment with the re'sentations and a, set -of visual .representations associated .with-.each of. the representations in resentation only in each set.
WHITNEY HASTINGS.'
US718768A 1934-04-03 1934-04-03 Game and educational device Expired - Lifetime US2062453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US718768A US2062453A (en) 1934-04-03 1934-04-03 Game and educational device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US718768A US2062453A (en) 1934-04-03 1934-04-03 Game and educational device

Publications (1)

Publication Number Publication Date
US2062453A true US2062453A (en) 1936-12-01

Family

ID=24887450

Family Applications (1)

Application Number Title Priority Date Filing Date
US718768A Expired - Lifetime US2062453A (en) 1934-04-03 1934-04-03 Game and educational device

Country Status (1)

Country Link
US (1) US2062453A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545381A (en) * 1949-01-24 1951-03-13 James M Prentice Electric questionnaire game
US2585099A (en) * 1947-05-14 1952-02-12 George W Emmert Quiz game apparatus
US2612431A (en) * 1947-04-07 1952-09-30 Jr David W Galloway Survey recorder
US2627672A (en) * 1950-04-17 1953-02-10 Dean Polton W Educational device
US2663091A (en) * 1949-12-02 1953-12-22 James E Brown Educational device
US2687579A (en) * 1952-01-23 1954-08-31 Hollie M Davis Teaching machine
US3089255A (en) * 1962-03-05 1963-05-14 Devry Technical Inst Inc Answer checking device
US3095654A (en) * 1961-09-14 1963-07-02 Ibm Educational device
US3144720A (en) * 1962-04-06 1964-08-18 Leslie L Kehl Teaching machine
US3195242A (en) * 1962-10-26 1965-07-20 Phillip L Ward Teaching apparatus
US3212199A (en) * 1961-07-12 1965-10-19 Litton Systems Inc Teaching machine
US4173832A (en) * 1977-03-25 1979-11-13 Chen Lim B Educational toy
US4299580A (en) * 1980-05-16 1981-11-10 Johnell Fields Educational object identification game
US4482329A (en) * 1982-01-07 1984-11-13 Tomy Kogyo Co., Inc. Teaching toy

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612431A (en) * 1947-04-07 1952-09-30 Jr David W Galloway Survey recorder
US2585099A (en) * 1947-05-14 1952-02-12 George W Emmert Quiz game apparatus
US2545381A (en) * 1949-01-24 1951-03-13 James M Prentice Electric questionnaire game
US2663091A (en) * 1949-12-02 1953-12-22 James E Brown Educational device
US2627672A (en) * 1950-04-17 1953-02-10 Dean Polton W Educational device
US2687579A (en) * 1952-01-23 1954-08-31 Hollie M Davis Teaching machine
US3212199A (en) * 1961-07-12 1965-10-19 Litton Systems Inc Teaching machine
US3095654A (en) * 1961-09-14 1963-07-02 Ibm Educational device
US3089255A (en) * 1962-03-05 1963-05-14 Devry Technical Inst Inc Answer checking device
US3144720A (en) * 1962-04-06 1964-08-18 Leslie L Kehl Teaching machine
US3195242A (en) * 1962-10-26 1965-07-20 Phillip L Ward Teaching apparatus
US4173832A (en) * 1977-03-25 1979-11-13 Chen Lim B Educational toy
US4299580A (en) * 1980-05-16 1981-11-10 Johnell Fields Educational object identification game
US4482329A (en) * 1982-01-07 1984-11-13 Tomy Kogyo Co., Inc. Teaching toy

Similar Documents

Publication Publication Date Title
US2062453A (en) Game and educational device
US3733075A (en) Device for displaying randomly selected symbol combinations and randomly operative player operated symbol changing means therefor
US2333002A (en) Device for games of numbers
US2030175A (en) Educational device
US2104718A (en) Educational apparatus
US4824376A (en) Educational device
US2197306A (en) Game
US2092577A (en) Game and educational device
US4104810A (en) Display device
US2663091A (en) Educational device
US1678573A (en) Amusement device
US2539754A (en) Timing
US2498578A (en) Educational device
US3195242A (en) Teaching apparatus
US3553867A (en) Word selecting device and method
US2860422A (en) Multiple answer electrical quiz game
US2221303A (en) Educational device
US3735500A (en) Educational device
US2573543A (en) Combined stereoscopic camera and viewer
US2958961A (en) Educational toy
US2924889A (en) Educational apparatus
US3477404A (en) Call board
US2142355A (en) Combination plug-in resistor and switch
US3270334A (en) Performance record having position code and present data comparisontype indicator
US2149754A (en) Control apparatus