CA1095158A - Static control device for printed circuit package - Google Patents

Static control device for printed circuit package

Info

Publication number
CA1095158A
CA1095158A CA312,325A CA312325A CA1095158A CA 1095158 A CA1095158 A CA 1095158A CA 312325 A CA312325 A CA 312325A CA 1095158 A CA1095158 A CA 1095158A
Authority
CA
Canada
Prior art keywords
circuit board
termination pads
conducting
board
shorting
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
Application number
CA312,325A
Other languages
French (fr)
Inventor
Clifford A. Rhodes
Edwin L. Bremenour
Timothy E. Mcadams
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.)
Allen Bradley Co LLC
Original Assignee
Allen Bradley Co LLC
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 Allen Bradley Co LLC filed Critical Allen Bradley Co LLC
Application granted granted Critical
Publication of CA1095158A publication Critical patent/CA1095158A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00Casings, cabinets or drawers for electric apparatus
    • H05K5/02Details
    • H05K5/0256Details of interchangeable modules or receptacles therefor, e.g. cartridge mechanisms
    • H05K5/026Details of interchangeable modules or receptacles therefor, e.g. cartridge mechanisms having standardized interfaces
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/14Mounting supporting structure in casing or on frame or rack
    • H05K7/1461Slidable card holders; Card stiffeners; Control or display means therefor
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00Screening of apparatus or components against electric or magnetic fields
    • H05K9/0067Devices for protecting against damage from electrostatic discharge

Abstract

Abstract of the Disclosure A protective package for use with a printed circuit board having mounted thereon at least one semiconductive device susceptible to deleterious effects of variance of potential across the terminals of the device or the presence of static electric discharges. The package provides, in one embodiment, a single piece, insulating case supporting and enclosing the entire circuit board and its components and a shorting member having integrally formed, spring biased contact fingers in normal engagement with the termination pads of the board. The contact fingers are separable from engagement with the termination pads upon insertion of the circuit board into an edge connector Another illustrated embodiment provides a holder or support for a shorting member which may enclose only a portion of a printed circuit board and only a portion including termination pads.

Description

This invention relates t~ an improved means for protect-ing semiconductor devices and, particularly, logic devices which have been premounted on printed circuit boards, from the effects of static electrical charges or other phenomena causing differences in potential across exposed terminals of the board.
The need for protection of semiconductor devices, such as MOS and C-MOS integrated circuits, from the deleterious effects of static electrical charges has long been recognized.
A discussion of the matter may be found in a publication o~
the Solid State Division of RCA entitled, "Digital Integrated Circuits, Application Note ICAN-6000" and subtitled, "Handling and Operating Considerations for MOS Integrated circuits" by S. Dansky and R. E. Funk. Further, U.S. Patent 4,019,094 granted to Dinger et al on April 19, 1977 describes in detail the problems involved and provides a solutlon in the form of a clip assembly for attachment to individual semiconductor packages. The clip assembly electrically short circuits the leads of the package and thereby prevents the buildup of a static charge on the active elements of the semiconductor ~hich might cause damage thereto.
Other examples illustrative of means for protecting semiconductor dev:ices per se are disclosed in U.S. Patents 3,648,108 granted to R. J. Bailey, 3,653,498 granted to T. W. Kisor, 3,746,157 granted to T. C. I'Anson, 3,774,075 granted to A. L. Medesha and 3,908,153 granted to G. C. Casont Jr.
The shorting clips or devices disclosed in the cited prior art are intended to be resiliently maintained in positive ~, .

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registration with the semiconductor package, thus leaving the lower ends o~ the package leads, such as for DIP packages, free in order that the clip may remain on the package throughout normal handling and assembly operations prior to insertion and soldering the leads in respective apertures of a printed circuit board.
The deleterious effects of static electrical charges upon semiconductor devices continue to be a problem even after the semiconductor devices are permanently attached to the boards.
That is, physical contact by a worker whose body has accumulated a static charge may, in all likelihood, damage one or more of the devices mounted on an unprotected printed circuit board just as in the cases of the package per se. In the matter of printed circuit boards, it will be apparent that these boards are designed to be inserted and replaced in connecting recep-tacles, such as edge board connectors or the like. The present invention contemplates the provision of continuity of protection for the various semiconductor devices mounted in a respective board before being inserted in and after it has been removed from the connecting receptacle.
According to the present invention, there is provided a lead shorting device for a printed circult board, wherein the board supports at least one semiconductor element susceptible to damage when exposed to static electrical charges, and where-in the lead shorting device includes: (a) an elongated connector having contacts engageable with termination pads on the circuit board, which pads are electrically connected wi-th the semi-conductor element; (2~ an insu].ating housing for the connector '.

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; at least partially surrounding the contacts, the housing being formed with a camming surface along an edge arranged to receive the circuit board and (3) a conducting terminal shorting member for said connector and including a plurality of integral conduct-ing portions arranged for normal engagement with and electrically shorting each of the respective termination pads and each portion including a cam follower cooperating with the camming surface on the housing for separating the conducting portions from their respective termination pads upon insertion of said circuit board into the connector.
Edge connectors utilized in the present invention are of conventional design and are adapted for support and electri-cal connection to a so-called "mother board".
It is, therefore, an object of the present invention to - provide a means for protecting one or more semiconductor devices or packages after they have been mounted on an other-wise unprotected printed circuit board.
A specific object of this invention is to provide a -shorting bar having integrally formed, resilient conducting fingers in normal mechanical and electrical engagement with respective termination pads of a printed circuit board, and which fingers are concurrently removed from said engagement as the board is inserted into a receptacle, such as an edge board connector.
Fig. 1 is a perspective view of the complete assembly of one embodiment of the present invention shown positioned in place relative to an edge connector;

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Fig. 2 is a plan view of the protective package o~ the present invention, wherein the cover member is illustra-ted prior to being folded down on integrally formed hinge portions for securing the cover member to an enclosed printed circuit board;
Fig. 3 is a cross-sectional view taken along lines 3-~3 of Fig. 2;
Fig. 4 is a cross-sectional view taken along lines 4--4 of Fig. 1 and showing the assembly with the enclosed printed circuit board fully inserted in an edge connector;
Fig. 5 is a view taken along the same plane as the view of Fig. 4, but illustrating the position of the contact fingers of the shorting bar prior to insertion of the printed circuit board in the edge connector;
Fig. 6 is a cross-sectional view taken along lines 6--6 of Fig. l;
Fig. 7 i5 a perspective view of another embodiment of this invention, wherein there is disclosed an assembly compris-ing two identical members, each including shorting members and each secured to opposite sides of a printed circuit board, but covering only the termination pads on only a portion of the board; and Fig. 8 is a sectional view taken along lines 8--8 of Fig. 7, and further showing the relationship of the assembly of Fig. 7 with a typical edge connector adapted to receive and support the assembly.
With reference to the various drawings, it will be observed that a completed assembly in accordance with one 4_ . ~ . - - .
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embodiment of this present invention preferably comprises a one-piece case, or cover member, indicated generally by the reference numeral 10. The cover member 10, as shown in Figs. 2 and 3, comprises oppositely disposed sidewalls 11 an~
12 joined by an integrally molded hinge portion 13. The longitudinally spaced hinge portions 13 are each defined by two spaced apart, parallel longitudinal grooves 14 and 15 (see Fig. 3). The cross section of each of the grooves 14 and 15 is preferably triangular to define an intermediate hinge surface 16, which preferably has a width substantially the same as, or slightly less than, the width of a printed circuit board 18 for purposes hereinafter discussed. The cover member 10 is preferably made of "Nylon 151" material which is readily obtainable, provides both flexibility and strength, and is inexpensive to purchase. Other moldable insulating materials such as polyethylene and polypropylene can also be used.
It will be further observed that an area 20 is provided in sidewall 11 to permit insertion in the molding die of a blank to form a window (not shown). The area 20 may be, if desired, used to receive an insert molded from clear acrylic plastic, or other material capable of passing ultraviolet light rays. It is well-known that many semiconductor logic devices, such as PROM's, may have their logic erased upon expo-sure to ultraviolet light.
~ gain, with reference to Figs. 1-3, inclusive, the case, or cover member 10, is further provided with laterally extend-ing integral feet 21 molded at opposite corners of the respective sidewalls 11 and 12. Each of the feet 21 is provided with a cam surface 22 and a shoulder 23, the latter -- - ~ . . -providing a detent for locking the assembled unit in place in a respective opening of a "mother board" 24, as will hereinafter be further discussed. The mother board 24 is f~lrther supported on a metallic rack 25 in accordance with usual practice.
For convenience in handling and inserting the packaged assembly, opposite end walls 26 are provided with integrally formed "barb-like" surfaces 27. The end walls 26 and top surfaces 28 define oppositely disposed cavities 29 arranged to receive a conventionally formed printed circuit board 30 therebetween. As previously discussed, when the sidewalls 11 and 12 are folded together along the hinge portions 13, the intermediate surface 16 of the hinge portions 13, being of substantially the same or very slightly less dimension than the thickness of the printed circuit board 30, will permit the board to be clamped between the uppermost portions of the sidewalls 11 and 12.
The printed circuit board 30 may be retained in place by means of nut and bolt assemblies 31 which also serve to hold the two sidewalls 11 and 12 together when folded along the hinge portions 13 (see Fig. 6).
As stated previously, the assembly of the present invention has particular application in the retention and protection of printed circuit boards bearing semiconductor members, such as RAM memory segments made from MOS or C-MOS integrated circuits, and generally inciicated by the reference numerals 33. Other semiconductor devices subject to damage, loss of memory, or other deleterious effects in the presence of electrostatic charges, may be protected by the packaging concept of the present invention.

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In the present embodiment, it will be noted that the memory segments 33 are each assembled to the printed circuit board 18 in the usual fashion; for instance, by means of DIP
(dual-in-line) packaging with terminals 34 protruding through preformed conducting apertures (nol shown~ in the circui.t board. As a means of illustration, it will be noted that the printed circuit board 18 includes a conventional array of spaced apart parallel termination pads 35 extending from one or both sides of the lower edge of the printed circuit board 18 as viewed relative to Figs. 1-6, inclusive~
The present invention contemplates, in addition to the novel insulating case 10, the provision of a pair of conduct-ing terminal shorting members on at least one of the sidewalls 11 and 12, and indicated generally by the reference numeral 38.
As shown in the present embodiment, two such members are mounted in the proximity of the outer surfaces of each of the sidewalls 11 and 12 of the cover member 10. The members 38 are substantially coextensive with the length of the cover member 10. The printed circuit board 18 may be convention-ally printed with conducting paths at opposite sides arrangedto be soldered to the inwardly extending terminals 34 of the segment.s 33 and which connect with termination pads or tabs 35 at the lower edge of one or both sides of the printed circuit board 18.
The shorting bar 38 is comprised of a metal stamping including a plurality of longitudinally spaced, integrally formed resilient contact fingers 3~. The fingers 39 provide the resilient conducting portion of the shorting member 38, and are arranged for spring bias towards normal mechanical and electrical engagement with respective termination pads 35 .
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on the printed circuit board. The termination pads 35 and the contact fingers 39 are longit~ldinally spaced in accordance with the usual accepted printed circuit board spacing standards.
The shorting member 38 is preferably fastened to the respective sidewalls 11 and 12 of the case 10 by means of providing a plurality of spaced apart apertures 40, which are pierced and formed with an outwardly extending dimpled area 41 for reception of inwardly projecting, preformed protuberances 42 (see Figs. 2 and 3) integrally formed during molding of the case or cover member 10. The distal end of each of the protuberances 42 projects through the respective openings 40 and i5 "heat staked" or othen~ise sealed into place in the dimpled area 41. Other means for fastening the shorting members 38 to the sidewalls 11 and 12 may also be used.
For instance, rivets, screws, etc. (not shown) inserted in apertures in the sidewalls 11 and 12 may be used to retain the members 38.
It will be further observed that the distal end portion of each of the contact fingers 39 is provided ~ith a reverse bend at 43 providing smooth surface for contact with termina-tion pads 35 and a cam portion 44 for sliding engagement with a receptacle, such as an edge connector, indicated generally by reference numeral 45.
With particular reference to Figs. 4-6, inclusive, it will be observed that the edge connector 45, although not itsel~
a part of the present invention, is of conventional construction and the salient features of which may be observed with reference to Figs. 4 and 5~ The connector 45 is preferably formed Oe plastic molding material including a coextensive, longitudinally arranged cavity 46 defined by the opposed integral sidewalls 47 of the connector 45. The upstanding sidewalls 47 are open ., - ' ' .

at the top to receive the printed circuit board 18 inserted therebetween and having its termination pads 35 arranged for sliding meehanical eontaet with conneetor terminal members 48. The connector terminals 48 pr~trude ~hrough the bottom of the edge connector 45, and are each engageable with conduct-ing openings in the "mother board" 24. Although not illustrated in detail, the mother board eonstruction is eonventional and includes a plurality of printed circuit paths for electrical and mechanical engagement with the protruding edge connector terminals 48.
It will be further observed that the conducting shorting member 38 has its respeetive contact fingers 39 in normally elosed electrical engagement with the respective termination pads 35 on the printed eircuit board 18. As will be observed from Fig. 4, when the entire assembly is seated in operating position on the edge eonneetor 45, the upper reversely bent portions 43 of the respective eontact fingers 38 will be forced by means of eam portion 44 towards the respective sidewalls 11 and 12, thus separating the eontact fingers 39 from their respeetive termination pads 35. Normal input and output signals may be then fed to the array of memory segments 33 as desired.
It will be observed with referenee to Fig. S that as the assembly ineluding the eover member 10 and printed eircuit board 18 is withdrawn from engagement with the edge eonneetor 45, the normally inwardly biased resilient eontaet ~ingers 39 will be permitted to bend inwardly to permit meehanieal and eleetrieal engagement between the respeetive termination pads -35 and the reverse bent portions 43. In sueh ease, inasmueh as eaeh of the eontaet fingers 39 is an integral part of the shorting member or bar 38, they will provide a means ' .

of establishing equal potential across each of the respective contacting termination pads 35 o~ the printed circuit board 18.
As such, there will be no opportunity for any extraneous static discharge or varianee in voltages to be impressed on termination pads 35 connected to the input/output leads of the memory segments 33 to cause the memory to be changed in any of the respective logic circuits of the respective memory segments 33. The insulating eover member or case 10, acting in eoneert with the shorting member 38, will also prevent eontact by the respective segments 33 with any adjaeent deviee or other objeet which might potentially discharge static electricity to cause other deleterious effects to the semi-eonduetor deviee.
It will be apparent that the assembly of the present embodiment provides an inexpensive and convenient method of proteeting memory arrays and other semiconduetor devices which are subject to deleterious effects upon exposure to eleetrostatie eharges or differenees in potential. In addition, although the packaging is illustrative of a double sidewall, hinged unit, it is within the provinee of this invention to utilize a construetion wherein only one side of the printed eireuit board 18 need be protected. Thus, the package eould ;
effeetively operate with only~one eover member either eomprising sidewall 11 or sidewall 12, assuming that the opposite side of the printed eircuit board is provided with an insulating eon-formal eoating or other means of proteeting the board.
Attention is now direeted to the views o~ Figs. 7 and ~
8 whieh are illustrative of another embodiment of the present~ ;
invention. For purposes of elarity, the same reference numerals :
will be used on like parts eomprising the assembly of both illustrated embodiments~.

~ - 1 0 -In the present embodiment, a holder or support member 51, molded of plastic material, is of a general "Z" cross-sectional configuration strengthened at opposite ends by means of the integrally molded webs 52. As sho~n, the holders 51 are mounted at opposite sides of a printed cir~uit board 18 and secured to the board by means of the nut and bolt assembly 31 extending through apertures (not shown) in a base portion 53 and in the circuit board 18. The sidewall 55 of each of the holders 51 is spaced from the printed circuit board 18 and arranged to support the shorting member 38 in the same manner as previously described in connection with the embodiment of Figs. 1-6, inclusive. That is, the shorting member 38 is fastened to the respective sidewall 55 by heat staking a protuberance 42, or by`other known fastening means. The resilient contact fingers 39 of the shorting member 38 normally contact the termination j pads 35 connected to the input/output leads of the memory segments 33.
It will be apparent from Fig. 7 that the holder 51 for a respective shorting member 38 may be of any desirable length that permits its contact fingers 39 to contact only those termination pads 35 leading to memory segments 33 which require protection. It is assumed, for purposes of discussion, that the termination pads 36 are connected to other devices on the printed circuit board 18 (not shown) which do not re~uire protection from deleterlous static electrical discharges.
As shown in Fig. 8, the assembly, comprising the oppositely~ -disposed holders 51 secured to the printed circuit board 18, is arranged to be seated within the cavity 46 of and electrically connected to the terminals 48 in the edge connector 45.
It will be apparent that/ although a pair of holders 51 is shown disposed at opposite sides of the board 18, at times ., - : - , --::- . ~ .

only one member 51 may be needed to protect termination pads on only one side of a board 18 (not shown). It is obvious that the embodiment of Figs. 7 and 8 is used where the added protection for the memory segments 33 provided by the cover member 10 of the first described embodiment illustrated in Figs. 1-6, inclusive, is not needed. Also, it will be apparent that in both preferred embodiments, tne contact fingers 39 may be joined together to provide a non-interrupted, resilient surface portion (not shown). The non-interrupted portion, like the spaced apart contact fingers 39, will normally contact the pads 35 and be formed to disengage the pads 35 upon insertion of the board in its edge connector.
The foregoing description of the present invention is only illustrative of exemplary forms which the invention may take. Still other modifications and variations may suggest themselves to persons skilled in the art. It is intended, therefore, that the foregoing detailed description be considered as exemplary only in that the scope of the invention be ascertained from the following claims.

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Claims (11)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A lead shorting device for a printed circuit board having mounted thereon at least one semiconductor element having terminals electrically engaging conducting circuit paths on said board, said paths terminating in spaced apart, conducting termination pads, and wherein said circuit board is removably insertable in an elongated connector device hav-ing contacts arranged for electrical engagement with respective ones of said termination pads and an insulating housing at least partially surrounding said contacts, said housing defin-ing an exposed camming surface, and wherein said semiconductor device is susceptible to deleterious effects in the presence of a difference in potential across its terminals prior to insertion of said board into said connector device, said lead shorting device including:
an insulating support member adapted for attachment to said circuit board and extending across the termination pads electri-cally connected to said semiconductor alement; and a conducting terminal shorting member supported by said support member including a plurality of integral, resilient conducting portions arranged for normal engagement with and electrically shorting each of the respective termination pads electrically connected to the semiconductor device, the resil-ient conducting portions of said shorting member each having cam follower means cooperating with the camming surface of the housing of said connector device for separating said portion from said termination pads upon insertion of said circuit board into said connector device.
2. The invention in accordance with claim 1, wherein the said insulating support member is elongated and has a base for attachment to said circuit board and an integral sidewall portion spaced from said termination pads, and wherein said conducting shorting member is attached to said sidewall portion.
3. The invention in accordance with claim 1, wherein the said insulating support member comprises a cover member molded of insulating material and further including an enclos-ing wall surface defining a cavity for receiving and covering the semiconductor element, the conducting circuit paths engaging the terminals of said element and the said termination pads.
4. The invention in accordance with claim 1, wherein the said insulating support member is of a molded unitized construction comprising two sidewalls joined by an integral longitudinal hinge portion, said hinge portion being configured to provide an intermediate relatively flat surface and oppositely disposed grooves, whereby when said sidewalls of said cover member are folded together with one edge of said circuit board abutting said flat surface, said circuit board will be clamped between said sidewall members at said hinge portion.
5. The invention in accordance with claim 1, wherein the semiconductor device is an integrated circuit memory logic component.

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6. The invention in accordance with claim 1, wherein said conducting shorting member comprises a metallic stamping including a base portion fastened to the sidewall of said support member, said resilient conducting portion comprising a plurality of spaced apart contact fingers extending laterally from said base portion and in normally closed engagement with respective ones of said termination pads, said contact fingers being further configured for sliding engagement with the camming surface of the housing of said connector device to provide said means for separation of said fingers from the respective termina-tion pads upon insertion of said circuit board into said connector device.
7. The invention in accordance with claim 4, wherein said circuit board includes spaced apart termination pads on opposite sides of said board, and wherein a conducting shorting member is provided for engagement with the oppositely disposed termination pads and comprises a pair of metallic stampings, each having a portion fastened to a respective sidewall of said cover member, said resilient conducting portion comprising a plurality of spaced apart contact fingers extending laterally from the respec-tive base portions of each of said stampings and in normally closed engagement with respective ones of said termination pads, said contact fingers being further configured for sliding engage-ment with the camming surface of the housing of said connector device to provide said means for separation of said fingers from the respective termination pads upon insertion of said circuit board into said connector device.
8. The invention in accordance with claim 6, wherein each of said contact fingers is provided with a camming surface for sliding engagement with said connector device during insertion and removal of said circuit board relative to said connector device.
9. The invention of claim 4, wherein said sidewalls include inwardly depending surfaces defining respective cavities for receiving said printed circuit board and devices mounted thereon and to provide a means of spacing said sidewalls from said board and devices.
10. The invention of claim 4, wherein releasable fastening means are provided to hold said folded sidewalls together and to further secure said circuit board between said sidewalls.
11. The invention of claim 3, wherein said enclosing wall surface includes a window portion of a material capable of transmitting ultraviolet light to said semiconductor element, and wherein said semiconductor element includes a logic memory erasable in the presence of ultraviolet light.
CA312,325A 1977-09-29 1978-09-28 Static control device for printed circuit package Expired CA1095158A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/838,172 US4138711A (en) 1977-09-29 1977-09-29 Static control device for printed circuit package
US838,172 1992-02-20

Publications (1)

Publication Number Publication Date
CA1095158A true CA1095158A (en) 1981-02-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA312,325A Expired CA1095158A (en) 1977-09-29 1978-09-28 Static control device for printed circuit package

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US (1) US4138711A (en)
CA (1) CA1095158A (en)

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US3566190A (en) * 1968-12-23 1971-02-23 Raven Ind Inc Industrial control system with means for releasably securing a plurality of electronic modules
US4015093A (en) * 1975-01-02 1977-03-29 General Electric Company Photoflash array having electrical shorting means
US4070557A (en) * 1976-07-26 1978-01-24 Northern Telecom Limited Apparatus for providing closed loop conditions in vacant module positions

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