DE1062036B - Process for the production of magnetic memory or switching matrices - Google Patents
Process for the production of magnetic memory or switching matricesInfo
- Publication number
- DE1062036B DE1062036B DET14705A DET0014705A DE1062036B DE 1062036 B DE1062036 B DE 1062036B DE T14705 A DET14705 A DE T14705A DE T0014705 A DET0014705 A DE T0014705A DE 1062036 B DE1062036 B DE 1062036B
- Authority
- DE
- Germany
- Prior art keywords
- matrix
- ferrite
- wires
- switching
- sprayed
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000011159 matrix material Substances 0.000 claims description 25
- 229910000859 α-Fe Inorganic materials 0.000 claims description 20
- 238000009413 insulation Methods 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- 230000006378 damage Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 4
- 239000004744 fabric Substances 0.000 claims 3
- 238000005507 spraying Methods 0.000 claims 3
- 239000000758 substrate Substances 0.000 claims 3
- 239000003990 capacitor Substances 0.000 claims 2
- 239000000919 ceramic Substances 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 2
- 239000002184 metal Substances 0.000 claims 2
- 229910052751 metal Inorganic materials 0.000 claims 2
- 238000010422 painting Methods 0.000 claims 2
- 229920001296 polysiloxane Polymers 0.000 claims 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims 1
- 230000001427 coherent effect Effects 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 claims 1
- 239000010949 copper Substances 0.000 claims 1
- 230000005347 demagnetization Effects 0.000 claims 1
- 239000000696 magnetic material Substances 0.000 claims 1
- 150000002739 metals Chemical class 0.000 claims 1
- 239000003973 paint Substances 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000011148 porous material Substances 0.000 claims 1
- 239000010453 quartz Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 238000010025 steaming Methods 0.000 claims 1
- 238000007740 vapor deposition Methods 0.000 claims 1
- 239000002966 varnish Substances 0.000 claims 1
- 239000011701 zinc Substances 0.000 claims 1
- 229910052725 zinc Inorganic materials 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
- H01F1/0311—Compounds
- H01F1/0313—Oxidic compounds
- H01F1/0315—Ferrites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49069—Data storage inductor or core
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49888—Subsequently coating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
Description
DEUTSCHESGERMAN
Die Erfindung bezieht sich auf Matrixanordnungen zur magnetischen Speicherung oder Übertragung von Informationen, wie sie z. B. in elektronischen Rechenmaschinen, elektronischen Wählanlagen, elektronischen Zuordnern und ähnlichen Einrichtungen verwendet werden.The invention relates to matrix arrangements for magnetic storage or transmission of Information such as B. in electronic calculating machines, electronic dialing systems, electronic Mappers and similar facilities are used.
Eine bereits allgemein bekannte Matrix dieser Art besteht aus einer regelmäßigen gitterförmigen Anordnung kleiner Ferrit-Ringkerne, die von einem System sich in den Ringen kreuzender Drähte, z. B. Schreib-, Lese- und Inhibitordrähte, durchflochten ist. Die Arbeitsweise eines Ferrit-Ringkernes mit rechteckförmiger Hystereseschleife als Speicher oder Schaltelement kann hier als bekannt verausgesetzt werden, ebenso wie die Arbeitsweise und Verdrahtung einer aus solchen Elementen aufgebauten Matrix. Solche Matrizen arbeiten bereits sehr zufriedenstellend; sie sind jedoch sehr teuer. Der hohe Preis rührt vor allem von der zeitraubenden und nur schwer zu vereinfachenden Durchfädelung der verschiedenen Drähte her und von einem relativ hohen Ausschuß infolge Beschädigung einzelner schon eingefädelter Ringkerne. Aus dem letztgenannten Grunde ist auch die Herstellung solcher Matrizen oberhalb einer gewissen Größe (z. B. 32 · 32 Kerne) unwirtschaftlich. Einer wesentlichen Verkleinerung solcher Matrizen, wie sie von der allgemeinen technischen Weiterentwicklung verlangt wird, ist eine praktische Grenze gesetzt, die bald erreicht sein dürfte.An already well-known matrix of this type consists of a regular grid-like arrangement small ferrite toroidal cores, which are formed by a system of wires crossing each other in the rings, e.g. B. writing, Read and inhibitor wires, is braided. How a ferrite toroidal core works with a rectangular Hysteresis loop as a memory or switching element can be assumed to be known here, as well as the operation and wiring of a matrix made up of such elements. Such Matrices are already working very satisfactorily; however, they are very expensive. The high price is the main thing from the time-consuming and difficult to simplify threading of the various wires and from a relatively high reject rate due to damage to individual toroidal cores that have already been threaded. the end The last-mentioned reason is also the production of such matrices above a certain size (e.g. 32 · 32 cores) uneconomical. A substantial reduction in the size of such matrices, like those of the general one technical development is required, a practical limit is set that will soon be reached should be.
Eine andere, ebenfalls bereits bekannte Matrixform ist die einer durchlöcherten Platte aus einem Ferrit mit rechteckförmiger Hystereseschleife. Durch das Lochsystem einer solchen Platte wird — wie bei der Ringkern-Matrix — ein System von mehreren Drähten durchgefädelt. Diese Matrixanordnung stellt einen gewissen technischen Fortschritt gegenüber der Ringkern-Matrix dar: Sie ist robuster gegenüber dem üblichen Verdrahtungsprozeß. Die Verdrahtung läßt sich auch fotochemisch aufdrucken, jedoch ist der Aufwand für dieses Verfahren nur bei sehr hohen Stückzahlen lohnend. Die Löcher einer Matrixplatte können leicht kleiner gehalten werden als bei der Ringkern-Matrix. Der für die magnetische Umschaltung der Lochumgebung erforderliche Stromimpuls kann daher verkleinert werden, was für den Betrieb mit Transistoren von Vorteil ist. Zugleich mit den Löchern verkleinert sich auch die Matrixfläche und damit der Platzbedarf des Speichers oder Schalters. Als Nachteile der Matrixplatte sind das immer noch erforderliche Drahtdurchfädeln zu betrachten und die beträchtlichen Kosten eines Preßwerkzeugs für eine große Zahl von kleinen Löchern.Another matrix form, also already known, is that of a perforated plate made of a ferrite with rectangular hysteresis loop. As with the Toroidal matrix - a system of several wires threaded through. This matrix arrangement represents one represents a certain technical progress compared to the toroidal core matrix: It is more robust compared to the usual wiring process. The wiring can also be photochemically printed, but the effort involved for this process only worthwhile with very high quantities. The holes of a matrix plate can can be kept slightly smaller than with the toroidal core matrix. The one for magnetic switching The current pulse required by the hole environment can therefore be reduced, which is essential for operation with Transistors is beneficial. At the same time as the holes, the matrix area and thus the Space requirement of the memory or switch. These are still required as disadvantages of the matrix plate Consider wire threading and the considerable cost of a crimping tool for large numbers of small holes.
Es ist auch bereits bekannt, das Durchfädeln der Drähte durch die Löcher einer Matrixplatte zu um-It is also already known to thread the wires through the holes of a matrix plate.
Verfahren
zur Herstellung von magnetischen
Speicher- oder Schaltmatrizenprocedure
for the production of magnetic
Storage or switching matrices
Anmelder:
Telefunken G.m.b.H.,
Berlin NW 87, Sickingenstr. 71Applicant:
Telefunken GmbH,
Berlin NW 87, Sickingenstr. 71
Dr.-Ing. Sigfrid Schweizerhof, Backnang (Württ),
ist als Erfinder genannt wordenDr.-Ing. Sigfrid Schweizerhof, Backnang (Württ),
has been named as the inventor
gehen, indem man die Drähte von vornherein in die Platte einpreßt, ähnlich wie bei dem ebenfalls bereits bekannten Verfahren, die Wicklung von Drosselspulen mit einer Hochfrequenzeisenmasse zu umspritzen. Ein weiterer Vorteil dieses Verfahrens soll in der unmittelbaren Umhüllung der stromführenden Drähte und in der damit verbundenen weiteren Verminderung des erforderlichen Schreib- oder Schaltstromimpulses liegen. Dieses Verfahren stößt nun jedoch in der Praxis auf ganz erhebliche Schwierigkeiten, so daß es als praktisch undurchführbar betrachtet werden muß. Abgesehen davon, daß es preßtechnisch sehr schwierig ist, das komplizierte Verdrahtungssystem mit seinen zahlreichen Zuführungen in das Ferritpulver einzupressen, hat eine aus Ferritpulver gepreßte Platte nicht die erforderlichen magnetischen Eigenschaften. Die Magnetisierungskurve einer solchen gepreßten Ferritplatte ist nämlich infolge der unvermeidlichen inneren Scherung keineswegs rechteckförmig, wie es für Speicher- und Schaltzwecke unbedingt erforderlich ist. Eine magnetisch günstig wirkende Nachsinterung einer solchen Platte mit eingepreßter Verdrahtung ist andererseits praktisch ausgeschlossen, denn infolge der hohen Sintertemperatur würde die Isolation der Drähte verlorengehen, wenn diese durch chemische Reaktionen nicht völlig zerstört werden.by pressing the wires into the plate from the start, similar to the one already done known method to encapsulate the winding of inductors with a high-frequency iron mass. A Another advantage of this method is said to be in the immediate encasing of the current-carrying wires and in the associated further reduction in the required write or switching current pulse. However, this method now encounters very considerable difficulties in practice, so that it as must be considered practically impracticable. Apart from the fact that it is very difficult to press is to press the complicated wiring system with its numerous feeds into the ferrite powder, a sheet pressed from ferrite powder does not have the required magnetic properties. Namely, the magnetization curve of such a pressed ferrite plate is inevitable due to the inner shear by no means rectangular, as it is absolutely necessary for storage and switching purposes is. A magnetically favorable re-sintering of such a plate with pressed-in wiring on the other hand is practically impossible because the high sintering temperature would reduce the insulation of the wires are lost if they are not completely destroyed by chemical reactions.
Es ist ferner ein Verfahren zur Herstellung einer magnetischen Speichermatrix vorgeschlagen worden, bei dem auf die Kreuzungspunkte des Verdrahtungssystems umhüllende Ferritperlen aufgesintert werden. Dies geschieht dadurch, daß die Kreuzungspunkte der Drähte zunächst mit einem Brei aus ferritbildenden Oxyden betropft werden und daß danach die gesamte Leiteranordnung zur Bildung der Ferritperlen auf die erforderliche Sintertemperatur erhitzt wird. Wie bereits aus obigen Ausführungen zu entnehmen ist, dürfteA method for producing a magnetic memory matrix has also been proposed, in which ferrite beads enveloping the crossing points of the wiring system are sintered. This is done by first covering the crossing points of the wires with a slurry of ferrite-forming compounds Oxides are dripped and that then the entire conductor arrangement to form the ferrite beads on the required sintering temperature is heated. As can already be seen from the above, should
909 578/218909 578/218
Claims (4)
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL113479D NL113479C (en) | 1958-02-06 | ||
| NL235768D NL235768A (en) | 1958-02-06 | ||
| DET14705A DE1062036B (en) | 1958-02-06 | 1958-02-06 | Process for the production of magnetic memory or switching matrices |
| FR1212618D FR1212618A (en) | 1958-02-06 | 1958-12-31 | Process for the production of magnetic recording or switching matrices |
| US790383A US3099874A (en) | 1958-02-06 | 1959-02-02 | Method of manufacturing magnetic core matrices |
| GB4258/59A GB871796A (en) | 1958-02-06 | 1959-02-06 | Method of producing magnetic storage matrices or switching matrices |
| FR815714A FR77024E (en) | 1958-02-06 | 1960-01-15 | Process for the production of magnetic recording or switching matrices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET14705A DE1062036B (en) | 1958-02-06 | 1958-02-06 | Process for the production of magnetic memory or switching matrices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1062036B true DE1062036B (en) | 1959-07-23 |
Family
ID=7547707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DET14705A Pending DE1062036B (en) | 1958-02-06 | 1958-02-06 | Process for the production of magnetic memory or switching matrices |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3099874A (en) |
| DE (1) | DE1062036B (en) |
| FR (1) | FR1212618A (en) |
| GB (1) | GB871796A (en) |
| NL (2) | NL113479C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1125971B (en) * | 1959-05-21 | 1962-03-22 | Ibm | Method for manufacturing a magnetic core matrix memory |
| DE1141393B (en) * | 1961-01-11 | 1962-12-20 | Siemens Ag | Ferromagnetic component, e.g. B. for parametric amplifiers |
| DE1213071B (en) | 1960-05-27 | 1966-03-24 | Ibm | Method of manufacturing a magnetic memory device |
| DE1246814B (en) * | 1961-11-30 | 1967-08-10 | Rca Corp | Method for producing an array of magnetic elements |
| DE1281601B (en) * | 1963-10-23 | 1968-10-31 | Rca Corp | Method for producing a magnetic element matrix |
| DE1282086B (en) * | 1962-10-04 | 1968-11-07 | Rca Corp | Method for operating a ferrite plate magnetic memory |
| DE1286234B (en) * | 1961-04-14 | 1969-01-02 | Plessey Co Ltd | Process for producing a matrix of thin-film magnetic toroidal cores |
| DE1290638B (en) * | 1962-06-29 | 1969-03-13 | Ibm | Magnetic storage matrix and process for its manufacture |
| DE1290971B (en) * | 1962-06-11 | 1969-03-20 | Rca Corp | Method for manufacturing a magnetic memory |
| DE1299038B (en) * | 1963-08-22 | 1969-07-10 | Rca Corp | Storage disk for magnetic storage |
| DE1300973B (en) * | 1965-03-19 | 1969-08-14 | Philips Patentverwaltung | Method for manufacturing memory matrix arrangements |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3300767A (en) * | 1960-08-30 | 1967-01-24 | Bunker Ramo | Woven screen magnetic storage matrix |
| NL272338A (en) * | 1960-12-23 | 1900-01-01 | ||
| US3264713A (en) * | 1962-01-30 | 1966-08-09 | Evans J Gregg | Method of making memory core structures |
| US3247573A (en) * | 1962-06-11 | 1966-04-26 | Rca Corp | Method of making magnetic ferrite sheet with embedded conductors |
| BE634300A (en) * | 1962-06-29 | |||
| US3309681A (en) * | 1962-08-21 | 1967-03-14 | Bunker Ramo | Multi-apertured memory arrangement |
| US3382571A (en) * | 1962-11-02 | 1968-05-14 | Ex Cell O Corp | Method of making a magnetic memory array |
| DE1279095B (en) * | 1963-06-11 | 1968-10-03 | Bunker Ramo | Magnetic matrix memory and method of manufacture |
| NL130452C (en) * | 1963-07-11 | |||
| GB1099493A (en) * | 1964-04-11 | 1968-01-17 | Nat Res Dev | Method for the construction of ferrite memory stores |
| US3392441A (en) * | 1965-12-23 | 1968-07-16 | Ibm | Method of fabricating magnetic storage devices |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH228763A (en) * | 1941-04-10 | 1943-09-15 | Bosch Gmbh Robert | Choke coil with high frequency iron. |
| DE1035810B (en) | 1955-12-22 | 1958-08-07 | Western Electric Co | Method of manufacturing a magnetic storage device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1555296A (en) * | 1923-10-12 | 1925-09-29 | Kirschner Felix | Process of manufacturing metal goods |
| US1934643A (en) * | 1930-01-14 | 1933-11-07 | Rafton Engineering Corp | Wire cloth and method of producing the same |
| NL76863C (en) * | 1947-06-03 | |||
| US2786779A (en) * | 1953-02-09 | 1957-03-26 | Dewrance & Co | Method and apparatus for powdered metal deposition by oxy-fuel gas flame |
| US2724103A (en) * | 1953-12-31 | 1955-11-15 | Bell Telephone Labor Inc | Electrical circuits employing magnetic core memory elements |
| NL193679A (en) * | 1954-12-30 | |||
| US3040301A (en) * | 1957-03-28 | 1962-06-19 | Gulton Ind Inc | Thin sheet ferrite memory matrix and method |
-
0
- NL NL235768D patent/NL235768A/xx unknown
- NL NL113479D patent/NL113479C/xx active
-
1958
- 1958-02-06 DE DET14705A patent/DE1062036B/en active Pending
- 1958-12-31 FR FR1212618D patent/FR1212618A/en not_active Expired
-
1959
- 1959-02-02 US US790383A patent/US3099874A/en not_active Expired - Lifetime
- 1959-02-06 GB GB4258/59A patent/GB871796A/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH228763A (en) * | 1941-04-10 | 1943-09-15 | Bosch Gmbh Robert | Choke coil with high frequency iron. |
| DE1035810B (en) | 1955-12-22 | 1958-08-07 | Western Electric Co | Method of manufacturing a magnetic storage device |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1125971B (en) * | 1959-05-21 | 1962-03-22 | Ibm | Method for manufacturing a magnetic core matrix memory |
| DE1213071B (en) | 1960-05-27 | 1966-03-24 | Ibm | Method of manufacturing a magnetic memory device |
| DE1141393B (en) * | 1961-01-11 | 1962-12-20 | Siemens Ag | Ferromagnetic component, e.g. B. for parametric amplifiers |
| DE1286234B (en) * | 1961-04-14 | 1969-01-02 | Plessey Co Ltd | Process for producing a matrix of thin-film magnetic toroidal cores |
| DE1246814B (en) * | 1961-11-30 | 1967-08-10 | Rca Corp | Method for producing an array of magnetic elements |
| DE1290971B (en) * | 1962-06-11 | 1969-03-20 | Rca Corp | Method for manufacturing a magnetic memory |
| DE1290638B (en) * | 1962-06-29 | 1969-03-13 | Ibm | Magnetic storage matrix and process for its manufacture |
| DE1282086B (en) * | 1962-10-04 | 1968-11-07 | Rca Corp | Method for operating a ferrite plate magnetic memory |
| DE1299038B (en) * | 1963-08-22 | 1969-07-10 | Rca Corp | Storage disk for magnetic storage |
| DE1281601B (en) * | 1963-10-23 | 1968-10-31 | Rca Corp | Method for producing a magnetic element matrix |
| DE1300973B (en) * | 1965-03-19 | 1969-08-14 | Philips Patentverwaltung | Method for manufacturing memory matrix arrangements |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1212618A (en) | 1960-03-24 |
| GB871796A (en) | 1961-06-28 |
| US3099874A (en) | 1963-08-06 |
| NL113479C (en) | |
| NL235768A (en) |
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