US3660806A - Connector - Google Patents

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Publication number
US3660806A
US3660806A US78684A US3660806DA US3660806A US 3660806 A US3660806 A US 3660806A US 78684 A US78684 A US 78684A US 3660806D A US3660806D A US 3660806DA US 3660806 A US3660806 A US 3660806A
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US
United States
Prior art keywords
base
tab
side walls
clasp
electrical connector
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
US78684A
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English (en)
Inventor
Joseph J De Stephan
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.)
ABB Installation Products Inc
Original Assignee
Thomas and Betts Corp
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 Thomas and Betts Corp filed Critical Thomas and Betts Corp
Application granted granted Critical
Publication of US3660806A publication Critical patent/US3660806A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/10—Sockets for co-operation with pins or blades
    • H01R13/11—Resilient sockets
    • H01R13/115—U-shaped sockets having inwardly bent legs, e.g. spade type

Definitions

  • the invention is directed to an improved, integral female electrical connecting device having unique, reversibly formed resilient inturned fingers depending from associated upstanding side walls and overhanging a generally planar base portion, establishing a multiplicity of interfaces arranged to provide firm electrical and mechanical contact with a selectively dimensioned mating tab resiliently encompassed therewithin,
  • the base, side walls, and the portions of the clasp fingers may be so proportioned relative to each other as to advantageously provide a flexing zone at each of the juncture between adjacent portions.
  • Each of the inturned free ends of the clasp fingers are provided with at least one sharp edge arranged to provide full linear contact with an associated mating tab.
  • the basic structure may be suitably modified by the addition of side tabs and base ribs to increase the contact areas thereof.
  • a generally centrally disposed upstruck portion of the base of the device may be arranged to cooperably detachably engage a complementary mating recessed portion in the mating tab.
  • the invention is directed to the field of electrical connecting devices and principally to a female electrical connecting member detachably engageable with a cooperably mating male tab for rapid connectable and disconnectable assemblies.
  • the female member of detachable electrical connecting devices generally comprised a boxlike tab receiving portion having relatively stiffly cantilevered downturned tab engaging clasp fingers overhanging the base thereof and terminating in a pair of free ends selectively spaced above said base to provide a restrictive tab receiving aperture having a height somewhat less than the thickness of a tab adapted to be inserted therein.
  • the invention is directed to an improved female electrical connecting device which overcomes the problems noted above with respect to prior art devices by providing a unique, integrally formed, highly resilient tab receiving portion of a female electrical connecting device which is more effective and efficient than such devices.
  • the tab receiving portion of the device comprises a generally planar base, upstanding side walls integral with the base and generally normal to the plane thereof, and clasp finger portions integral with the side walls and extending first towards each other and then, in unique fashion, backwardly towards the side walls, the terminating edges of the finger portions being selectively spaced above the base a predetermined distance to provide a partially restrictive tab receiving aperture therebetween.
  • the base, side walls, and clasp fingers are dimensionally proportioned relative to each other as to provide a plurality of highly resilient flexing zones, each defined generally by the juncture between adjacent elements of the tab receiving portion of the device.
  • Each of the free ends of the clasp fingers are provided with at least one longitudinally disposed sharp edge arranged to provide highly concentrated, full linear contact with the adjacent surface of a mating tab inserted within the tab receiving portion of the device.
  • a generally central portion of the base may be deformed upwardly to provide a small dome or tab adapted to detachably engage a complementary recessed portion in said mating tab.
  • each of the side walls generally intermediate the length thereof may be suitably deformed inwardly as, for example, by lancing or detenting, to provide a tab or protrusion adapted to frictionally engage the adjacent edges of a mating tab disposed between said side walls.
  • the base of the device may be further modified by the addition of upstanding ribs or rails, preferably longitudinally disposed thereupon, providing both additional discrete contact areas between said base and the mating tab, and guide means for smoothly directing the mating tab into the tab receiving aperture of the device. It is therefore an object of this invention to provide an improved female electrical connecting device.
  • FIG. 1 is a front elevational view, partly in section, of a female electrical connecting device constructed in accordance with the concepts of the invention.
  • FIG. 2 is a top plan view of the device of FIG. 1.
  • FIG. 3 is a front elevational view, in section, of the tab receiving portion of a female electrical connecting device constructed in accordance with another embodiment of the invention.
  • FIG. 4 is a front elevational view, in section, of still another embodiment of the tab receiving portion of a female electrical connecting device constructed in accordance with the concepts of the invention.
  • FIG. 5 is a front elevational view of yet another embodiment of the tab receiving portion of a female electrical connecting device constructed in accordance with the concepts of the invention.
  • FIG. 6 is a partially fragmented top plan view, partly in section, of the device of FIG. 5.
  • FIG. 7 is a front elevational view, in section, of still a further embodiment of the tab receiving portion of a female electrical connecting device constructed in accordance with the concepts of the invention.
  • FIG. 8 is a bottom plan view of the device of FIG. 7.
  • FIG. 9 is a front elevational view, in section, of still another embodiment of a female electrical connecting device constructed in accordance with the concepts of the invention.
  • FIG. 10 is a perspective view of the device of FIG. 9.
  • FIG. 11 is a partially fragmented front elevational view of still a further embodiment of the tab receiving portion of a female electrical connecting device constructed in accordance with the concepts of the invention showing, in section, a portion of a mating tab cooperably engaged therewithin.
  • FIG. 12 is a top plan view of a portion of a typical mating tab as may be used in conjunction with the device of FIG. 10.
  • FIG. 13 is a side elevational view of the tab of FIG. 12.
  • FIG. 14 is a partially fragmentary top plan view, partly in section, of the device of FIG. 11.
  • Tab receiving portion 20 of a female electrical connecting device formed of resilient conductive material and constructed in accordance with the concepts of the invention.
  • Tab receiving portion 20 comprises a generally planar base 22, upwardly directed longitudinally extending side walls 24, 24 disposed preferably normal to base 22 and integral therewith, and opposing, inwardly turned longitudinally extending clasp fingers 26, 26' integral respectively with side walls 24, 24'.
  • each of the clasp fingers 26,26 comprise a first portion 28, 28', respectively, disposed in generally parallel planar alignment with base 22, and a second portion 30, 30 integral respectively with first portions 28, 28 and extending backwardly towards their associated side walls 24, 24' respectively, in acute angular relationship therewith.
  • the terminating ends 32, 32' respectively of second portions 30, 30 are selectively spaced above base 22 dimensionally less than the thickness of a mating tab 36 (see FIGS. 12 and 13) adapted to be engageably encompassed therebetween.
  • the leading corners 34, 34' respectively of clasp finger second portions 30, 30', as shown in FIG. 2 are preferably tapered, as shown, to assist in at least partially guiding mating tab 36 into proper engagement with tab receiving portion 20.
  • the spacing between terminating ends 32, 32 of clasp finger section portions 30, 30' respectively and base 22 will at least partially determine the insertion and retraction force required to facilitate the assembly and disassembly of said male tab 36 therewithin.
  • clasp fingers 26, 26' As a mating tab such as 36 is insertably advanced within the aperture partially defined by clasp finger ends 32, 32 and base 22, ends 32, 32' are caused to be resiliently deflected upwardly towards first portions 28, 28, pivoting generally about the junctures 38, 38 between portions 30 and 28 and portions 30' and 28, respectively. Because of their unique cantilevered construction, clasp fingers 26, 26 may be caused to further deflect at the junctures 40, 40 between first portion 28 and side wall 24 and first portion 28 and side wall 24', respectively, and at the junctures 42, 42' between side wall 24 and base 22 and side wall 24 and base 22, respectively.
  • clasp fingers 26, 26 are advantageously increased as a result of the novel arrangement between adjacent integral portions thereof.
  • clasp fingers 26, 26 have been described as deflecting generally about discrete junctures as indicated above, in use, the portions between such junctures, as, for example, side wall 24 between junctures 40 and 42, first portion 28 between junctures 40 and 38, and second portion 30 are correspondingly subject to deflection, further increasing the desirably resilient characteristics of tab receiving portion 20, and substantially reducing the force required to cooperably insert a mating tab such as 36 therewithin while maintaining adequate and sufficient mechanical and electrical connection therebetween.
  • clasp fingers 26, 26 may be subjected to relatively severe deflecting forces without causing a permanent deformation of the associated portions thereof.
  • terminating edges 33, 33' of second portions 30, 30' respectively are configured to provide generally sharp, full, linear contact between each of said edges 33, 33 and the ad- "Ills jacent surface of a mating tab such as 36, high contact force therebetween.
  • Clasp fingers 46, 46 of tab receiving portion 44 comprise first overhanging portions 48, 48' structurally similar to portions 28, 28. of FIG. 1, and second portions 50, 50' integral therewith and extending therefrom directionally towards side walls 52, 52 respectively, said second portions 50, 50 deflecting generally about a relatively large curved area defined thereby.
  • Edges 51, 51' of second portions 50, 50' respectively are configured to provide a generally sharp profile similar to edges 33, 33 described above with respect to FIG. 1, and operate in like manner to afford increased linear contact between said edgesSl, 51' and the mating tab adjacent surface. It should be understood, however, that edges 51, 51' may be modified to provide other suitable contact areas such as by the use of serrations or tooth-like projections without departing from the spirit of the invention.
  • FIG. 4 a further modification of the clasp fingers 54, 54' of a tab receiving portion 56 of a female electrical connecting device is shown.
  • Intermediate each of the first overhanging portions 58, 58' and the second intumed portions 60, 60' thereof are interconnecting third portions 62, 62' depending generally downwardly towards the base 62 of tab receiving portion 56, providing additional deflectable junctures as at 64, 64', further increasing the desirable deflectable characteristics of tab receiving portion 56.
  • edges 63, 63 of second portions 60, 60 may be suitably formed to provide a relatively sharp contour serving to insure full linear contact with an adjacent surface of a mating tab.
  • second portions 60, 60' of the modified tab receiving portion 56 illustrated in FIG. 4 are shown as generally flat planar segments, other suitable contours such as generally arcuate portions 50, 50 (see FIG. 3) may be substituted therefore without departing from the spirit of the invention.
  • FIGS. 5 and-6 there is shown a further modification of a tab receiving portion 66 of a female electrical connecting device constructed in accordance with the concepts of the invention.
  • tabs 72, 72' Depending inwardly in generally opposing relationship from the inner surfaces 68, 68 respectively of side walls 70, 70 of tab receiving portion 66 are tabs 72, 72' arranged to frictionally bear against the adjacent edges of a tab such as 36 inserted within tab receiving portion 66, thus providing additional areas of contact therebetween, even with undersized mating tabs, and collaterally serving to at least partially restrict the sidewise movement of tab 36 within tab receiving portion 66.
  • tabs 72, 72' are illustrated as lanced or partially separated from their respective side walls 70, 70' in FIGS.
  • FIG. I wherein protrusions 74, 74 are so formed from their respective upstanding side walls 76, 76 depending from base 78 of tab receiving portion 80 therein.
  • the generally flat planar base 82 of tab receiving portion 66 may be suitably modified by providing thereon upwardly directed, generally longitudinal, spaced ribs or protrusions such as elements 84, 84' as shown in FIGS. 7 and 8, or elements 86, 86 as shown in FIG. 11, or elements 88, 88' as shown in FIGS, 9 and 10.
  • elements 84, 84' as shown in FIGS. 7 and 8
  • elements 86, 86 as shown in FIG. 11, or elements 88, 88' as shown in FIGS, 9 and 10.
  • Base 82 of tab insuring a desirably receiving portion 66 of FIGS. 5 and 6 may be further modified to provide a generally centrally disposed upwardly directed locking projection or tab illustrated as element 94 in FIGS. 9 and 10, as element 96 in FIG. 11, and as element 100 in FIG. 14, arranged to cooperably engage an appropriately contoured recessed portion such as 98 in tab 36, as shown in FIGS. 12 and 13.
  • FIGS. 9 and 10 there is shown a further embodiment of a female electrical connecting device 102 constructed in accordance with the concepts of the invention.
  • Adjacent one end of device 102 is a generally cylindrical, suitably deformable wire receiving portion 104 shown for illustrative purposes only and forming no part of the invention.
  • Adjacent the other end of device 102 is a tab receiving portion 106.
  • a pair of tabs 1 10 lanced from a portion of its associated side wall and arranged to frictionally deflectably engage the adjacent edges 112 of a male tab such as 36 inserted within tab receiving portion 106.
  • Raised ribs 88, 88 depending inwardly from base 112 of tab receiving portion 106 and locking tab 94 projecting upwardly from base 106 generally intermediate ribs 88, 88' have been referred to above, as being further modifications of similar elements heretofore disclosed, raised ribs 88, 88' serving to provide additional discrete contact areas between tab receiving portion 106 and a mating tab such as 36 arranged to be received therewithin.
  • Wire receiving portion 104 although shown as an uninsulated, open seam, generally cylindrical member adapted to be compressively deformed about the bare end of an insulated electrical conductor (not shown) or the like, may have other suitable configurations, such as a closed barrel or U-shaped ferrule, either insulated or uninsulated. Similarly, such portion 104 may be formed as a spade, ring, or fork tongue terminal appropriately engageable with a stud or other similar fastening means.
  • FIG. 14 there is shown a further modification of a tab receiving portion 1 14 of a female connector member constructed in accordance with the concepts of the invention, illustrating a modified dome-like locking tab 100 projecting upwardly from base 116 intennediate side walls 118, 118 and arranged to matingly engage a complementarily formed recess such as 98 in a tab such as 36 (see FIGS. 12 and 13).
  • Tabs 120, 120' depending inwardly, respectively, from side walls 118, 118' are selectively deformed from a portion thereof providing generally resilient protrusions frictionally engageable with the adjacent edges 112 of a tab such as 36 in a manner similar to that illustrated with respect to elements 74, 74' in FlG.11.
  • An electrical connector member comprising: a coupling portion; and a clip portion; said clip portion having a generally planar base, longitudinally extending upstanding side walls integral with said base, and clasp fingers integral with said side walls remote from said base; each of said clasp fingers having a first portion adjacent its associated side wall and overhanging said base in generally parallel planar relationship therewith and a second inturned portion extending from said first portion in generally acute angular relationship therewith and directed towards its associated side wall, each of said upstanding side walls being proportioned relative to said base so as to provide a first flexing zone at the juncture therebetween, each of said upstanding side walls being proportioned relative to its associated adjacent clasp finger first overhanging portion so as to provide a second flexing zone at the juncture therebetween, and each of said clasp finger first overhanging portions being proportioned relative to its associated adjacent clasp finger second intumed portion so as to provide a third flexing zone at the juncture therebetween, each of said clasp finger second portions terminating at a free
  • each of said clasp fingers further comprises a third portion intermediate said first and said second portions thereof and integral therewith, said third portion being proportioned relative to its associated adjacent clasp finger first portion and its associated adjacent clasp finger second portion so as to provide a fourth flexing zone at the juncture between said third portion and said first portion, and a fifth flexing zone at the juncture between said third portion and said second portion.
  • each of said side walls has at least one protruding portion adjacent the inner surface thereof generally intermediate the ends of said side wall.
  • each of said side walls has at least one protruding portion adjacent the inner surface thereof generally intermediate the ends of said side wall, and wherein said base has at least two generally parallel, longitudinally extending raised portions thereon spaced substantially intermediate said side walls.
  • An electrical connector member as defined in claim 7 further comprising a longitudinally disposed first edge defined by the intersection of said free end and an adjacent surface of said second inturned portion, said first edge being directed generally downwardly towards said base for yieldingly contacting the adjacent surface of a tab disposed within said tab receiving aperture.
  • each of said first edges is longitudinally disposed generally parallel to said base.
  • each of said first edges is longitudinally disposed generally parallel to said base.

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
US78684A 1970-10-07 1970-10-07 Connector Expired - Lifetime US3660806A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7868470A 1970-10-07 1970-10-07

Publications (1)

Publication Number Publication Date
US3660806A true US3660806A (en) 1972-05-02

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ID=22145602

Family Applications (1)

Application Number Title Priority Date Filing Date
US78684A Expired - Lifetime US3660806A (en) 1970-10-07 1970-10-07 Connector

Country Status (10)

Country Link
US (1) US3660806A (enrdf_load_stackoverflow)
JP (1) JPS5119583B1 (enrdf_load_stackoverflow)
BE (1) BE773639A (enrdf_load_stackoverflow)
CA (1) CA939773A (enrdf_load_stackoverflow)
DE (2) DE7137853U (enrdf_load_stackoverflow)
FR (1) FR2111120A5 (enrdf_load_stackoverflow)
GB (1) GB1359334A (enrdf_load_stackoverflow)
IT (1) IT940109B (enrdf_load_stackoverflow)
NL (1) NL7113802A (enrdf_load_stackoverflow)
SE (1) SE386774B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905671A (en) * 1973-03-07 1975-09-16 Siemens Ag Clamping connector
US4031614A (en) * 1975-11-19 1977-06-28 Gte Sylvania Incorporated Method of making two-piece electrical contact
US4764133A (en) * 1986-02-19 1988-08-16 Yazaki Corporation Male terminal for electrical connection
US5281178A (en) * 1992-10-26 1994-01-25 Yazaki Corporation Electrical connector with feature for increased contact area
US5395270A (en) * 1992-10-01 1995-03-07 Yazaki Corporation Weak mating force female terminal
WO1997004498A1 (en) * 1995-07-19 1997-02-06 The Whitaker Corporation Magnet wire terminal having tab coating piercing contact end
WO1997048149A1 (en) * 1996-06-14 1997-12-18 Framatome Connectors International Pin bushing
FR2784813A1 (fr) * 1998-10-19 2000-04-21 Framatome Connectors Int Rail de contact comprenant des douilles femelles frontales pour relier entre eux plusieurs rails de contact
US6293831B1 (en) * 1998-04-16 2001-09-25 Calsonic Kansei Corporation Electric connector
US20090029605A1 (en) * 2005-12-06 2009-01-29 Toyota Jidosha Kabushiki Kaisha Female Connector Terminal and Female Connector
WO2013117382A3 (en) * 2012-02-09 2014-03-13 Orkli, S.Coop. Thermocouple connector for an electromagnetic gas valve
WO2017102725A1 (fr) * 2015-12-17 2017-06-22 Delphi International Operations Luxembourg S.À R.L. Contact femelle avec lames latérales de maintien pour contact mâle et ensemble de connexion comportant de tels contacts femelle et mâle
US10027037B2 (en) * 2016-07-06 2018-07-17 Te Connectivity Corporation Terminal with reduced normal force

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5666301U (enrdf_load_stackoverflow) * 1979-10-29 1981-06-03
US4713026A (en) * 1986-10-08 1987-12-15 Interlock Corporation Tab receptacle terminal having improved electrical and mechanical features
GB8824719D0 (en) * 1988-10-21 1988-11-30 Amp Great Britain Electrical tab receptacle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744244A (en) * 1952-09-26 1956-05-01 Aircraft Marine Prod Inc Electrical connector
US3163484A (en) * 1960-12-27 1964-12-29 Philips Corp Electric terminal
DE1197950B (de) * 1962-08-03 1965-08-05 Stocko Metallwarenfabriken Federklammer fuer elektrische Flachsteckerverbindungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744244A (en) * 1952-09-26 1956-05-01 Aircraft Marine Prod Inc Electrical connector
US3163484A (en) * 1960-12-27 1964-12-29 Philips Corp Electric terminal
DE1197950B (de) * 1962-08-03 1965-08-05 Stocko Metallwarenfabriken Federklammer fuer elektrische Flachsteckerverbindungen

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905671A (en) * 1973-03-07 1975-09-16 Siemens Ag Clamping connector
US4031614A (en) * 1975-11-19 1977-06-28 Gte Sylvania Incorporated Method of making two-piece electrical contact
US4764133A (en) * 1986-02-19 1988-08-16 Yazaki Corporation Male terminal for electrical connection
US5395270A (en) * 1992-10-01 1995-03-07 Yazaki Corporation Weak mating force female terminal
US5281178A (en) * 1992-10-26 1994-01-25 Yazaki Corporation Electrical connector with feature for increased contact area
WO1997004498A1 (en) * 1995-07-19 1997-02-06 The Whitaker Corporation Magnet wire terminal having tab coating piercing contact end
WO1997048149A1 (en) * 1996-06-14 1997-12-18 Framatome Connectors International Pin bushing
US6293831B1 (en) * 1998-04-16 2001-09-25 Calsonic Kansei Corporation Electric connector
FR2784813A1 (fr) * 1998-10-19 2000-04-21 Framatome Connectors Int Rail de contact comprenant des douilles femelles frontales pour relier entre eux plusieurs rails de contact
EP1003258A1 (en) * 1998-10-19 2000-05-24 Framatome Connectors International An electrical conductor rail providing frontal sockets for the interconnection of several conductor rails
US20090029605A1 (en) * 2005-12-06 2009-01-29 Toyota Jidosha Kabushiki Kaisha Female Connector Terminal and Female Connector
US7775840B2 (en) 2005-12-06 2010-08-17 Toyota Jidosha Kabushiki Kaisha Female connector terminal with internal plate spring
WO2013117382A3 (en) * 2012-02-09 2014-03-13 Orkli, S.Coop. Thermocouple connector for an electromagnetic gas valve
US9178304B2 (en) 2012-02-09 2015-11-03 Orkli, S. Coop Thermocouple connector adapted to an electromagnetic gas valve, and thermocouple comprising the connector
RU2615044C2 (ru) * 2012-02-09 2017-04-03 Оркли, С.Кооп. Комбинация термопары и электромагнитного газового клапана
RU2615044C9 (ru) * 2012-02-09 2017-05-22 Оркли, С.Кооп. Комбинация термопары и электромагнитного газового клапана
WO2017102725A1 (fr) * 2015-12-17 2017-06-22 Delphi International Operations Luxembourg S.À R.L. Contact femelle avec lames latérales de maintien pour contact mâle et ensemble de connexion comportant de tels contacts femelle et mâle
FR3045964A1 (fr) * 2015-12-17 2017-06-23 Delphi Int Operations Luxembourg Sarl Contact femelle avec lames laterales de maintien pour contact male et ensemble de connexion comportant de tels contacts femelle et male
CN108370112A (zh) * 2015-12-17 2018-08-03 德尔福国际业务卢森堡公司 用于公接头的具有横向保持片的母接头以及包括这种母接头和公接头的连接组装件
US10027037B2 (en) * 2016-07-06 2018-07-17 Te Connectivity Corporation Terminal with reduced normal force

Also Published As

Publication number Publication date
JPS5119583B1 (enrdf_load_stackoverflow) 1976-06-18
DE2149838A1 (de) 1972-04-13
FR2111120A5 (enrdf_load_stackoverflow) 1972-06-02
CA939773A (en) 1974-01-08
DE2149838C3 (de) 1974-12-19
SE386774B (sv) 1976-08-16
DE7137853U (de) 1972-09-14
NL7113802A (enrdf_load_stackoverflow) 1972-04-11
DE2149838B2 (enrdf_load_stackoverflow) 1974-05-22
GB1359334A (en) 1974-07-10
BE773639A (fr) 1972-04-07
IT940109B (it) 1973-02-10

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