US2281958A - Mounting means for relays - Google Patents

Mounting means for relays Download PDF

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Publication number
US2281958A
US2281958A US291721A US29172139A US2281958A US 2281958 A US2281958 A US 2281958A US 291721 A US291721 A US 291721A US 29172139 A US29172139 A US 29172139A US 2281958 A US2281958 A US 2281958A
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US
United States
Prior art keywords
relay
connectors
relays
recesses
plugged
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
US291721A
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English (en)
Inventor
Clarence S Snavely
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.)
Hitachi Rail STS USA Inc
Original Assignee
Union Switch and Signal Inc
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
Priority to BE477673D priority Critical patent/BE477673A/xx
Application filed by Union Switch and Signal Inc filed Critical Union Switch and Signal Inc
Priority to US291721A priority patent/US2281958A/en
Priority to GB4526/40A priority patent/GB536355A/en
Application granted granted Critical
Publication of US2281958A publication Critical patent/US2281958A/en
Priority to FR952079D priority patent/FR952079A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/04—Mounting complete relay or separate parts of relay on a base or inside a case
    • H01H50/047—Details concerning mounting a relays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
    • B61L23/08—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only
    • B61L23/12—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only partly operated by train

Definitions

  • My invention relates to mounting means for relays.
  • Another object of my invention is to construct a pair of plug-in connectors in such manner that only relays having certain preselected characteristics can be plugged into the connectors.
  • a further object of my invention is to provide, in connection with an electrical connector into which a relay is adapted to be plugged, novel latching means for preventing the relay from becoming accidentally dislodged" from its associated connector.
  • FIG. 1 is a front elevational view showing two different re- One object of my present inven-
  • Fig. 2 is a side view of one of the plug-in connectors forming part of the supporting means embodying my invention, certain of the parts being broken away or removed to better illustrate the construction of the remaining parts.
  • Figs. 3 and 4 are rear and bottom views, respectively, of the connector shown in Fig. 2.
  • Fig. 5 is a detail view of the locking cover plate forming part of the mounting means illustrated in Fig. 1.
  • Fig. 6 is a detail view showing a key and identification plate comprising part of the mounting means illustrated in Fig. 1.
  • Fig. '7 is a detail view of the back cover plate for the relay A illustrated in Fig. 1 showing the cover plate as it is initially moulded.
  • FIG. 8 is a view similar to Fig. '7 showing a portion of the material removed from the bottom of the cover plate in a preselected manner to provide a means for preventing a relay having the wrong characteristics from being plugged into a pair of connectors.
  • Fig. 9 is a right-hand side view of the end plate 62 shown in Fig. 1 and comprising part of the mounting means embodying my invention.
  • the reference character A designates a polar relay of the general type described and claimed in my Patent No. 2,140,604, referred to hereinbefore
  • the reference character B designates a neutral relay of the general type described in my application, Serial No. 141,311, also referred to hereinbefore.
  • My present invention is concerned primarily with a mounting means for relays of these general types, and not with the details of construction of the relays except insofar as the detailed parts cooperate with the mounting means, and it is believed, therefore, that for a clear understanding of my present invention, it is sufiicient to point out that each of these relays comprises a plurality of contact members I, the outer ends of which project outwardly from the opposite sides of the relay in superposed parallel spaced relation, and the inner ends of which cooperate with each other to form contacts, or are connected with the energizing winding of the relay, as the case may be, it being noted that the neutral relay is provided with a greater number of projecting contact members than the polar relay, and that the spacing of the contact members of the two relays is different.
  • the mounting means for the relay A comprises two plug-in connectors CI and C2 which are secured at their lower ends to the upper side of a support 2 in the proper horizontally spaced relation to cooperate with the outer ends of the contact members I at the opposite sides of the relay, while the mounting means for the relay B comprises two other connectors C3 and 04 which are similarly secured at their lower ends to the support 2 in the proper horizontally spaced relation to cooperate with the outer ends of the contact members I of relay B at the opposite sides of this latter relay.
  • All four of the plug-in connectors CI, C2, C3 and C4 are similar except for certain minor differences necessitated by the differences in spacing of the projecting contact members of these two relays, and the fact that the connectors CI and C3 are left-hand connectors, while the remaining two connectors are right-hand connectors, and it is believed, therefore, that a clear understanding of all will be had from a description of only one.
  • this connector comprises a block .6 of insulating material having moulded therein a plurality of slots I each of which receives a conducting strip 8.
  • the slots I are spaced apart vertically the same distances as the projecting contact members I on the associated relay, and are made somewhat wider vertically than the combined thicknesses of the i conducting strips and the contact members I except for two longitudinally spaced restricted portions 9 and I0, which portions are just wide enough to receive the strips with a snug fit. These restricted portions each engage the associated conducting strip 8 at the opposite ends of an offset portion II formed. in the strip, and thus prevent the strips from moving endwise in the slots.
  • each conducting strip is supplied with an upturned bend I2 which engages the associated slot at a radius I3 provided at the forward end of the slot to insure that the relay contact members will be properly guided into the slot, and the portion of each strip between the upturned bend and the offset portion I I is formed into a gradual curve in such manner that the strip will exert an initial spring force against the radius and the lower side of the slot to provide a good cleaning action when the relay contact members are inserted into the slot, but that, any bending of the strips caused by engagement with the relay contact members I will not cause the strips to take a permanent set.
  • each conducting strip projects rearwardly "beyond the rear face of the block for a suitable of their lengths by means of insulating plates I5 disposed in recesses I6. These plates are secured to the block by means of rivets H, or their equivalent, and serve to hold the fingers in place in the slots.
  • The'block 6 is secured to the support 2, which as here shown is in the form of a T-bar, by means of two screws I8 which pass through clearance holes in the support and are screwed into threaded inserts I9 moulded into the block.
  • the block 6 of the connector CI is further provided in the side nearest the relay A, as viewed in Fig. 1, with a recess which is directly opposite a similar recess provided in the block 6 of the connector C2.
  • These two recesses cooperate with lugs 2I which are moulded or otherwise formed on the relay A to position the relay relative to the connectors when the relay is being plugged in in such manner that the contact members I will align properly with the slots in' the connectors, and these recesses also serve as a preselecting means whereby only those relays which have lugs properly located to enter the recesses 20 can be plugged into the connectors CI and C2.
  • lugs which will align with the recesses 20 will only be provided on one type of relays such for example as polar relays similar to the relay A, and it follows, therefore, that these lugs serve to prevent a relayfrom being replaced by any relay which is not a similar relay, whereby the proper operation of the system is guaranteed.
  • the two connectors C3 and C4 are each provided with a pair of vertically spaced recesses 23 and 24 which cooperate with lugs 25 formed on the relay B to position this latter relay relative to the connectors when it is being plugged in, and to prevent the wrong, type of relay from being accidentally plugged into these connectors.
  • connectors shown are particularly adapted to cooperate with relays of the particular type shown, similar connectors may .be utilized in connection with other types of relays or electrical devices having laterally projecting contact members. It should also be noted that when connectors of the type described are used with other relays or devices, the connectors will preferably be provided with 00- operating recesses and lugs similar to those provided in connection with the connectors and relays shown, but these latter lugs and recesses will be so positioned that only relays or devices of such other type can be plugged into a particular set of connectors.
  • these means comprise a key plate provided at each end with a laterally projecting ear 3I which ears fit into recesses 33 moulded into the lower sides of the blocks 6 of the two associated connectors in such manner that when the connectors are secured to the frame 2 with the ears 3
  • the key plate 30 is formed with a vertical front portion 30a upon which the name or number of the relay is intended to be marked or stenciled, or to which a suitable identification tag may be secured, and with a horizontal portion 30b provided with a plurality of holes 300, ten such holes being provided in the plate illustrated in Fig. 6. These holes selectively receive a plurality of pins 34 which, when the associated relay is being plugged into the associated connector, enter recesses 35 formed on some part of the case of the relay, preferably the back plate.
  • Each pin 34 is formed at its lower end with an annular flange which rests on top of the support, and which has a larger diameter than the diameter of the holes 300, whereby when a pin is placed in a hole and the key plate is fastened in place, it will be automatically held by the plate in an upright position.
  • each back plate with a plurality of numbers each of which aligns with a different hole in the key plate when the relay is in position to be plugged in and each of which is sep arated from the adjacent number by a mark in the manner shown in Figs. 7 and 8, and to subsein the case of the relay A, the back plate of which is shown in Figs.
  • a similar identification and registration means will of course be provided for each type of relay which is used in the system, whether it be a polar relay similar to relay A, a neutral relay similar to relay B, or some other relay which is mounted in the same manner as relays A and B. It should be particularly pointed out that while in describing the identification and registration means embodying my invention, I have for convenience referred to the projections carried by the key plate as pins and the openings which are provided in the relay for the reception of the pins as recesses, it will be obvious that the spaces between the pins carried by the key plate might be regarded as recesses and the projections on the relay which define the recesses as pins, in which event the registration means might be said to comprise projections on the relay cooperating with recesses formed on the key plate, or as intermeshing projections one set of which is formed on the relay and the other set of which is formed on the key plate.
  • One advantage of the above described identifying and registration means is that a relay of the correct type but wrong piece number cannot be plugged into a pair of connectors.
  • the mounting means embodying my invention further comprises a plurality of cover plates 36, one of which is associated with each pair of similarly disposed connectors for the purpose of securing the relays in place in the connectors, and for the further purpose of preventing accidental contact by metal objects with the contact members of the relay or the front ends of the conducting strips, or both, in a manner which might cause short circuits.
  • this cover plate comprises a body portion 36a provided at one end with a U-shaped return bend 36c and at the other end with an L-shaped portion 36b which is hingedly connected to a U-shaped flat spring 31.
  • Spring 31 fits into mating recesses 38 formed in the contiguous faces of the blocks 6 of the connectors Cl and C2 in such manner that when the spring is once inserted in place within the recesses 38 its inherent resiliency will cause its front end to engage the upper side of the slot formed by the recesses behind shoulders 38a, whereby the spring cannot be removed except by inserting a flat strip of metal into the rear end of the slot above the spring and forcing the upper end downwardly to a position in which it clears the shoulders 38a.
  • the spring may then be pulled out from the front end of the slot.
  • the forward ends of the slot are beveled at 39 in the manner shown.
  • the body portion 36a of the cover plate 36 cooperates adjacent its lower end with forwardly extending laterally aligned projections moulded on to the blocks 6 of the two contiguous connectors, while the U- shaped return bend 360 is adapted to hook over upstanding forwardly extending laterally aligned projections 6
  • the bend 35c hooks'over the projections ti on the adjacent connectorsCl and C4, and under these conditions the back sides of the edges of the cover plate overliethe forward faces of the relays A and B and thus hold the relays in place in the connectors.
  • it is necessary to move the cover plate to its released position in which it is shown in dotted lines in Fig. 2, and to accomplish this result it is necessary to push upwardly on the lower leg of the L-shaped portion 351) in a manner to raise the U-shaped portion 36c above the projections BI and then pull outwardly on the upper end of the cover plate, whereupon the cover plate will drop by gravity to its unlatched position. This may be conveniently done by the thumb and one of the fingers of either hand. To latch the cover plate in place the reverse procedure is followed. It will be noted that the necessary movement of the cover plate required to clear the projection BI is permitted by the resiliency of the spring 31.
  • One advantage of mounting means embodying my invention is that if a circuit failure occurs for some undetermined cause when a relay is in place, all circuits through the relay and associated connectors may be tested from the front of the relay without removing the relay or breaking its seal, both sides of all contacting surfaces being accessible by lowering the cover plate to the removal position.
  • the failure may be isolated at either plug connector contacting surface, at the contacts of the relay, or in the circuit leading up to the connector.
  • plug-in connector it is necessary to move the connections in order to test, which disturbs the contacting surfaces between the relay and connector, and if the failure had occurred at this point it is impossible to be certain of this fact.
  • mounting means embodying my invention is that all break-down connections are on the front side of the frame, and all permanent or soldered connections are on the rear side of the frame. This facilitates the installation process as well as testing procedure.
  • a further advantage of mounting means embodying my invention is that all contacting surfaces are protected from injury as well as from dirt.
  • the locking cover plates prevent injury to the conducting strips and also act as a dirt cover. Also the contacting surfaces of the plug connector conducting strips are underneath the strips so that they shed rather than collect dust.
  • Another advantage of mounting means embodying my invention is that the pressure between the relay contact members and the conducting strips is assured since the shape, proportions and materials of the strips have been chosen with this end in view. This insures proper cleaning action'when the relay is inserted and removed.
  • a support having a plurality of plug-in connectors disposed thereon in pairs for mounting a plurality of relays on the support, one pair of connectors being provided for each relay and each connector being formed with slots containing conducting strips for receiving projecting contact members provided on the associated relay, the two connectors of adjacent pairs being disposed side by side, mating recesses formed in adjacent connectors, and a cover plate hinged to a spring fitting into said recesses and provided at its free end with means for engaging projections on the associated connectors for latching the relays in place in the adjacent pairs of connectors.
  • a frame two plug-in connectors secured to said frame in parallel spaced relation, each said connector being provided with contact members adapted to engage the contact members of a relay device to establish electrical contact therewith and with a recess in its lower face, a key plate secured to said frame by means of ears one of which is disposed in each of said recesses, and registry means on said plate adapted to register with other means on said relay when said relay is being plugged into said connectors to prevent a relay from being plugged into said connectors unless it is provided with the proper registry means.
  • a frame two plug-in connectors secured to said frame in parallel spaced relation and each provided in its lower face with a recess, an electrical device adapted to be plugged into said connectors provided in its lower portion with registry means, and a key plate secured to said frame by means of ears one of which is disposed in each of said recesses and having mounted therein in preselected arrangement registry means adapted to cooperate with the registry means on said device, said registry means being susceptible of different arrangements, whereby the type of relay which can be plugged into said connectors can be preselected.
  • a frame a pair of plugin connectors secured to said frame in parallel spaced relation, an electrical device adapted to be supported on said frame and connected with external circuits through the medium of said connectors, and registry means secured to said frame and selected in accordance with the type of device which is intended to be mounted in said connectors and effective to prevent a device which is not provided with cooperating registry means from being plugged into said connectors.
  • a support plug-in connectors secured to said support for establishing electrical contact with an electrical device to be mounted on the support, a key plate secured to the support and provided with a plurality of holes, pins disposed in selected ones of said holes, and recesses formed in said device opposite said pins for receiving said pins while said device is being plugged into said connectors, whereby only preselected ones of similar devices can be plugged into said connectors.
  • a support provided with means adapted to support an electrical device of one type only at one location and an electrical device of a different type at a different location, means at each location adapted to prevent devices of the wrong type from being supported at such location, and other means for effecting a further selection in the device which can be supported at either location to limit the devices to certain preselected ones.
  • the combination with mounting means for supporting an electrical device of means provided on the device adapted to cooperate with means provided on the support to effect a selection between devices having similar physical characteristics but different operating characteristics, at least one of said means being formed by providing removable portions preselected ones of which are removed to form recesses and the other means comprising projecting pins adapted to enter the recesses formed by the removed portions, said pins and removable portions being susceptible of a variety of different arrangements to provide a relatively large number of combinations.
  • the combination with mounting means for supporting an electrical device of means provided on the device adapted to cooperate with means provided on the support to effect a selection between devices having similar 'physical characteristics but different operating characteristics, at least one of said means being formed by providing numbered removable portions preselected ones of which are removed to form recesses and the other means comprising projecting pins adapted to enter the recesses formed by the removed portions, said pins and removable portions being susceptible of a variety of difierent arrangements to provide a relatively large number of combinations, and the numbers remaining after the portions are removed being utilized as a piece number for identification purposes.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Patch Boards (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
US291721A 1939-08-24 1939-08-24 Mounting means for relays Expired - Lifetime US2281958A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE477673D BE477673A (en)) 1939-08-24
US291721A US2281958A (en) 1939-08-24 1939-08-24 Mounting means for relays
GB4526/40A GB536355A (en) 1939-08-24 1940-03-11 Improvements relating to electrical relays
FR952079D FR952079A (fr) 1939-08-24 1947-08-14 Dispositifs de montage pour relais

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US291721A US2281958A (en) 1939-08-24 1939-08-24 Mounting means for relays

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US2281958A true US2281958A (en) 1942-05-05

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BE (1) BE477673A (en))
FR (1) FR952079A (en))
GB (1) GB536355A (en))

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617846A (en) * 1949-10-20 1952-11-11 Gen Railway Signal Co Shelf mounted plug coupled detachable type relay
US2767353A (en) * 1952-09-26 1956-10-16 Square D Co Panelboard
US2798930A (en) * 1953-11-20 1957-07-09 Robert M Frost Convertible range
US2883587A (en) * 1954-10-21 1959-04-21 Westinghouse Electric Corp Circuit breaker panels
US2886793A (en) * 1955-01-13 1959-05-12 Kaz Mfg Co Inc Vaporizer carrier and stand
US2889493A (en) * 1959-06-02 Miniature radar assembly
US2910630A (en) * 1956-03-29 1959-10-27 Gen Electric Circuit breaker panelboard
US2916675A (en) * 1957-01-09 1959-12-08 Wadsworth Electric Mfg Co Inc Means for preventing interchangeability of circuit breakers of similar construction but different capacity
US2917676A (en) * 1955-07-22 1959-12-15 Hoffman Electronics Corp Electrical chassis mounting construction or the like
US2928998A (en) * 1956-05-18 1960-03-15 Ite Circuit Breaker Ltd Keyed mounting means for circuit breakers
US2929966A (en) * 1954-12-13 1960-03-22 Gen Electric Electrical apparatus assembly with sequence bussing
US2946033A (en) * 1956-05-15 1960-07-19 Bell Telephone Labor Inc Polarized connector for printed circuit cards
US2958014A (en) * 1957-02-12 1960-10-25 Sperry Rand Corp Interlocking systems
US2974259A (en) * 1957-10-23 1961-03-07 Fed Pacific Electric Co Circuit breakers and panelboards therefor
US3007150A (en) * 1956-10-22 1961-10-31 Radar Relay Inc Electric lamp annunciator indicating assembly
US3022480A (en) * 1957-02-07 1962-02-20 Tiffany Frank Emery Sandwich circuit strips
US3037153A (en) * 1958-09-16 1962-05-29 Cutler Hammer Inc Circuit breaker panel assembly
US3041504A (en) * 1958-06-02 1962-06-26 Telemecanique Electrique Switchboard assembly
US3046453A (en) * 1958-09-19 1962-07-24 Fed Pacific Electric Co Circuit breakers and enclosures therefor
US3065386A (en) * 1959-04-15 1962-11-20 Square D Co Electrical panelboard
US3089063A (en) * 1958-05-27 1963-05-07 Wadsworth Electric Mfg Co Panel board and circuit breaker combination
US3105173A (en) * 1955-02-16 1963-09-24 Square D Co Electrical panelboard
US3119051A (en) * 1959-04-24 1964-01-21 Fed Pacific Electric Co Circuit breakers and panelboard assemblies therefor
US3120628A (en) * 1956-12-05 1964-02-04 I T E Circuit Braker Company Selective mounting for circuit interrupters
US3174077A (en) * 1959-04-28 1965-03-16 Murray Mfg Corp Circuit breaker load center
US3200361A (en) * 1962-07-20 1965-08-10 Sperry Rand Corp Printed circuit board connector assembly
US3452280A (en) * 1967-07-31 1969-06-24 Us Air Force Module test fixture having module-key sensing and test probe elements
US3850493A (en) * 1971-09-24 1974-11-26 Trw Inc Multiway connector for a printed circuit board

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE940992C (de) * 1952-03-30 1956-03-29 Siemens Ag Anordnung an Relaisgestellen bei Eisenbahn-Sicherungseinrichtungen
DE1022625B (de) * 1954-04-09 1958-01-16 Deutsche Bundesbahn Relais, im besonderen fuer Eisenbahnsicherungseinrichtungen

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2889493A (en) * 1959-06-02 Miniature radar assembly
US2617846A (en) * 1949-10-20 1952-11-11 Gen Railway Signal Co Shelf mounted plug coupled detachable type relay
US2767353A (en) * 1952-09-26 1956-10-16 Square D Co Panelboard
US2798930A (en) * 1953-11-20 1957-07-09 Robert M Frost Convertible range
US2883587A (en) * 1954-10-21 1959-04-21 Westinghouse Electric Corp Circuit breaker panels
US2929966A (en) * 1954-12-13 1960-03-22 Gen Electric Electrical apparatus assembly with sequence bussing
US2886793A (en) * 1955-01-13 1959-05-12 Kaz Mfg Co Inc Vaporizer carrier and stand
US3105173A (en) * 1955-02-16 1963-09-24 Square D Co Electrical panelboard
US2917676A (en) * 1955-07-22 1959-12-15 Hoffman Electronics Corp Electrical chassis mounting construction or the like
US2910630A (en) * 1956-03-29 1959-10-27 Gen Electric Circuit breaker panelboard
US2946033A (en) * 1956-05-15 1960-07-19 Bell Telephone Labor Inc Polarized connector for printed circuit cards
US2928998A (en) * 1956-05-18 1960-03-15 Ite Circuit Breaker Ltd Keyed mounting means for circuit breakers
US3007150A (en) * 1956-10-22 1961-10-31 Radar Relay Inc Electric lamp annunciator indicating assembly
US3120628A (en) * 1956-12-05 1964-02-04 I T E Circuit Braker Company Selective mounting for circuit interrupters
US2916675A (en) * 1957-01-09 1959-12-08 Wadsworth Electric Mfg Co Inc Means for preventing interchangeability of circuit breakers of similar construction but different capacity
US3022480A (en) * 1957-02-07 1962-02-20 Tiffany Frank Emery Sandwich circuit strips
US2958014A (en) * 1957-02-12 1960-10-25 Sperry Rand Corp Interlocking systems
US2974259A (en) * 1957-10-23 1961-03-07 Fed Pacific Electric Co Circuit breakers and panelboards therefor
US3089063A (en) * 1958-05-27 1963-05-07 Wadsworth Electric Mfg Co Panel board and circuit breaker combination
US3041504A (en) * 1958-06-02 1962-06-26 Telemecanique Electrique Switchboard assembly
US3037153A (en) * 1958-09-16 1962-05-29 Cutler Hammer Inc Circuit breaker panel assembly
US3046453A (en) * 1958-09-19 1962-07-24 Fed Pacific Electric Co Circuit breakers and enclosures therefor
US3065386A (en) * 1959-04-15 1962-11-20 Square D Co Electrical panelboard
US3119051A (en) * 1959-04-24 1964-01-21 Fed Pacific Electric Co Circuit breakers and panelboard assemblies therefor
US3174077A (en) * 1959-04-28 1965-03-16 Murray Mfg Corp Circuit breaker load center
US3200361A (en) * 1962-07-20 1965-08-10 Sperry Rand Corp Printed circuit board connector assembly
US3452280A (en) * 1967-07-31 1969-06-24 Us Air Force Module test fixture having module-key sensing and test probe elements
US3850493A (en) * 1971-09-24 1974-11-26 Trw Inc Multiway connector for a printed circuit board

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Publication number Publication date
GB536355A (en) 1941-05-12
BE477673A (en))
FR952079A (fr) 1949-11-09

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