EP0138713A1 - Verbinderanordnung zum Testen einer Schaltplatte - Google Patents

Verbinderanordnung zum Testen einer Schaltplatte Download PDF

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Publication number
EP0138713A1
EP0138713A1 EP84402063A EP84402063A EP0138713A1 EP 0138713 A1 EP0138713 A1 EP 0138713A1 EP 84402063 A EP84402063 A EP 84402063A EP 84402063 A EP84402063 A EP 84402063A EP 0138713 A1 EP0138713 A1 EP 0138713A1
Authority
EP
European Patent Office
Prior art keywords
jumper
contacts
plug
base
male
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.)
Granted
Application number
EP84402063A
Other languages
English (en)
French (fr)
Other versions
EP0138713B1 (de
Inventor
Francis Raphal
Jean-Paul André Roy
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.)
Societe Anonyme de Telecommunications SAT
Original Assignee
Societe Anonyme de Telecommunications SAT
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 Societe Anonyme de Telecommunications SAT filed Critical Societe Anonyme de Telecommunications SAT
Publication of EP0138713A1 publication Critical patent/EP0138713A1/de
Application granted granted Critical
Publication of EP0138713B1 publication Critical patent/EP0138713B1/de
Expired 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
    • H01R31/00—Coupling parts supported only by co-operation with counterpart
    • H01R31/08—Short-circuiting members for bridging contacts in a counterpart
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/712—Coupling devices for rigid printing circuits or like structures co-operating with the surface of the printed circuit or with a coupling device exclusively provided on the surface of the printed circuit
    • H01R12/716—Coupling device provided on the PCB
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2201/00—Connectors or connections adapted for particular applications
    • H01R2201/20—Connectors or connections adapted for particular applications for testing or measuring purposes

Definitions

  • the present invention relates to a connection device for a printed circuit, comprising a receptacle having at least two parallel male contacts, a jumper having at least two parallel female contacts and a plug having at least two parallel female contacts, the male contacts of the receptacle being plugged into the female contacts of the jumper and the male contacts of the base being pluggable into the female contacts of the plug.
  • connection device is used to test printed circuit boards and in particular to detect faults relating to the electrical continuity of the printed conductors.
  • the jumper is a rectangular block having female contacts which are blind and whose length is equal to that of the male contacts of the base.
  • the two female contacts of the jumper are electrically connected to each other by a short-circuit included in the jumper in order to normally connect two printed conductors of the card to which the ends of the male contacts are soldered.
  • the plug known as the test plug is a rectangular block longer than the jumper, in the female contacts of which the male contacts of the socket are plugged in after having removed the jumper from the socket.
  • the test sheet is thus not capable of testing the connection of the two printed conductors. The sheet only tests each of the conductors printed individually.
  • the jumper and the plug each have two pairs of parallel and juxtaposed contacts
  • a 180 ° reversal of the jumper or of the plug around the direction of the contacts again makes it possible to insert the jumper or the plug in the socket.
  • Such a reversal generates errors in the measurements and can only be avoided by requiring special attention from the operator when making the connections.
  • the object of the present invention is to provide a connection device for a printed circuit of the type defined in the entry into material which makes it possible to electrically connect the female contacts of the plug to the female contacts of the jumper when the jumper is inserted in the base in order to test printed conductors connected in pairs through the jumper.
  • connection device is characterized in that the female contacts of the jumper completely pass through the jumper and have a length less than the length of the male contacts of the base and in that the male contacts of the base are pluggable. in the female contacts of the plug after the jumper has been inserted into the socket, the male contacts of which completely pass through the female contacts of the jumper.
  • the base, the jumper and the plug are stacked parallel to the contacts, which makes it possible to connect the female contacts of a pair of the plug with two printed conductors short-circuited through the jumper.
  • the assembly of a first element of the device such as the base, respectively the jumper, with a second element of the device such as the jumper or the plug, respectively the plug includes keying means for part in the first element and partly in the second element to assemble in the first element the second element in a single position relative to the first element.
  • the keying means such as a longitudinal tongue of one of the first and second elements cooperating with a groove of the other element prevents any assembly of the jumper with the base, or of the plug with the base, or of the plug with the jumper after having turned the jumper or plug 180 °.
  • the assembly of a first element of the device such as the base, respectively the jumper, with a second element of the device such as the jumper or the plug, respectively the plug comprises means for part. in the first element and partly in the second element to lock in translation parallel to the direction of insertion the second element in the first element.
  • connection device comprises, according to the illustrated embodiment, a female receptacle 1 with four pairs of male electrical contacts 21 1 - 21 ' 1 to 21 4 - 21' 4 , two male-female jumpers 3 1 , 3 2 each having two pairs of contacts female electrical 4 1 - 4 ' 1 and 4 2 - 4' 2 ' 4 3 - 4 ' 3 and 4 4 - 4 ' 4' and two test plugs 5 1 , 5 2 each having two pairs of female electrical contacts 6 1 - 6 ' 1 and 6 2 - 6' 2 , 6 3 - 6 ' 3 and 6 4 - 6 ' 4 .
  • Elements 1, 3 1 , 3 2 , 5 1 and 5 2 are made of plastic.
  • the base 1 has a longitudinal U-shaped section having a front bottom 10 with a square section and rear branches 11 and 11 ′ to square section.
  • the base includes four pairs of parallel conductive pins 2 1 - 2 ' 1 to 2 4 - 2' 4 which are arranged relative to each other in a distribution identical to that of the pairs of holes T 1 - T ' 1 to T 4 - T ' 4 of the printed circuit board CI.
  • Each pin 2 1 to 2 4 , 2 ' 1 to 2' 4 crosses perpendicularly the bottom 10 of the base and is fixed to the bottom 10.
  • the bottom 10 shares each pin 2 1 to 2 4 , 2 ' 1 to 2' 4 in a first part bent at a right angle 20 1 to 20 4 , 20 ' 1 to 20' 4 directed towards the lower branch 11 of the base, and in a second straight part forming the male contact 21 1 to 21 4 , 21 ' 1 to 21 ' 4 between branches 11 and 11'.
  • the ends of the first bent parts 20 1 to 20 4 and 20 ' 1 to 20' 4 form spikes which pass through the metallized holes T 1 to T 4 , T ' 1 to T ' 4 and which are welded respectively to them, preferably to the tin wave, after the lower branch 11 of the base is pressed against the printed circuit board between the edge B and the row of holes T 1 to T 4 .
  • the first parts of pins 2 1 to 2 4 , 2 ' 1 to 2' 4 are straight and perpendicular to the bottom 10 of the base 1; in this case, the jumpers 3 1 , 3 2 and the plugs 5 1 , 5 2 are inserted perpendicular to the printed circuit board CI.
  • the male contacts 21 1 to 21 4 and 21 ' 1 to 21' 4 are arranged parallel to the branches 11 and 11 'and have a length substantially equal to the length L 3 of the branches 11 and 11'.
  • the first row of first contacts 21 1 to 21 4 is above the lower branch 11 and at a distance from the latter equal to the distance between the second row of first contacts 21 ' 1 to 21' 4 and the upper branch 11 '.
  • the internal face of the branch lower 11 of the base comprises two tongues 12 1 and 12 2 parallel to the male contacts.
  • the face internal branch 11 ' At the transverse edge of the upper branch 11 ′ of the base, the face internal branch 11 'has a transverse tongue 13 perpendicular to the male contacts.
  • Each jumper 3 1 , 3 2 has a longitudinal U-shaped section and is composed of a front parallelepiped block 30 1 , 30 2 and two rear branches 31 1 and 31 ' 1 , 31 2 and 31' 2 .
  • Each block 30 1 , 30 2 of jumper contains two pairs of female contacts 4 1 - 4 ' 1 and 4 2 - 4' 2 , 4 3 - 4 ' 3 and 4 4 - 4' 4 which are suitable for receiving the pairs of male contacts 21 1 -21 ' 1 and 21 2 - 21' 2 , 21 3 - 21 ' 3 and 21 4 - 21' 4 respectively when assembling the jumper and the base.
  • Each female contact of a rider is formed by a sheath made of metal blades passing right through the rider's block.
  • Each block 30 1 , 30 2 of a jumper forms with first parts 32 1 and 32 ' 1, 32 2 and 32' 2 of the branches 31 1 and 3 1 ' 1 , 31 2 and 31' 2 of the jumper, a part male having longitudinal and transverse external profiles complementary to the longitudinal and transverse internal contours of one half of the base 10 containing two contact pairs 21 1 - 21 ' 1 and 21 2 -21' 2 , 21 3 -21 ' 3 and 21 4 - 21 ' 4 .
  • each jumper 3 1 , 3 2 is formed a longitudinal central blind groove 34 1 , 34 2 to receive the respective tongue 12 1 , 12 2 of the base, and at the upper end of the first part 32 ' 1' 32 ' 2 of branch of the rider is formed a transverse groove 35 1 , 35 2 to receive one half of the transverse tongue 13 of the base.
  • the length L 3 , the width l 3 and the height H 3 of the male part 30 1 - 32 1 - 32 ' 1 , 30 2 - 3 2 2 - 32' 2 of each jumper are respectively equal to the length and the half-width of the branches 11 and 11 'of the base, and at the spacing between the branches 11 and 11'.
  • the length of the male contacts 21 1 to 21 4 and 21 ' 1 to 21' 4 is substantially equal to the length L 3 of the branches 11 and 11 ', end portions of the male contacts exit from the rear face of the blocks 30 1 and 30 2 over a length equal to that of the first parts of branch 32 1 , 32 ′ 1 , 32 2 , 32 ′ 2 when the blocks of the jumpers are inserted and pushed against the internal face of the bottom 10 of the base.
  • the jumpers 3 1 and 3 2 are preferably of the type comprising short circuits for connecting two-by-two respectively the sleeves 4 1 and 4 ' 1 to 4 4 and 4' 4 of the pairs and therefore the associated printed conductors at holes T 1 and T ' 1 to T 4 and T' 4 .
  • the assembly of the groove 34 1 and the tongue 12 1 in particular serves as polarizing means so that a reversal at 180 ° of the jumper cannot allow the insertion of the jumper in the base and therefore the unwanted connection of the two other male contacts 21 2 and 21 ' 2 .
  • the assembly of the groove 35 1 , 35 2 of each rider with the transverse tongue 13 of the base serves as keying means and also as means for locking in longitudinal translation of the riders in the base following the folding of the flexible branch upper 11 ′ of the base after the introduction of the jumper block 30 1 , 3 0 2 .
  • Each of the branches 31 1 , 31 ' 1 , 31 2 , 3 1 ' 2 of the jumpers 3 1 , 3 2 is composed of the first part 32 1 , 32 ' 1 , 32 2 , 32' 2 already mentioned and a second end part 33 1 , 33 ' 1 , 33 2 , 33' 2 projecting outwards.
  • the distance between the second branch parts of each jumper is equal to the distance H 3 between the branches 11 and 11 'of the base 1.
  • the outer faces 36 1 , 36' 1 , 36 2 , 36 ' 2 of the seconds parts of the riders' branches are crenellated transversely in order to facilitate the gripping of the riders.
  • each jumper 3 1 , 3 2 On the inner face of the second lower branch 31 1 , 31 2 of each jumper 3 1 , 3 2 is provided a central longitudinal tongue 37 1 , 37 2 having a cross section identical to that of the transverse tongues 12 1 and 12 2 on the lower branch 11 of the base 1.
  • each test sheet 5 1 , 5 2 has a generally parallelepiped shape and has a parallelepiped block before 50 1 , 50 2 , a male intermediate portion 51 1 , 51 2 and a slender rear portion 52 1 , 52 2 .
  • Each block 50 1 , 50 2 has dimensions identical to the parallelepiped space between the branch parts 32 1 and 32 ' 1 , 32 2 and 32' 2 of each jumper 3 1 , 3 2 .
  • the length L 5 of the blocks 50 1 , 50 2 is equal to the length of the first branch parts 32 1 and 32 ' 1 , 32 2 and 32' 2 of the jumpers
  • the height H 5 of the blocks 50 1 , 50 2 is equal to the spacing between the branch parts 32 1 and 32 ' 1 , 322 and 32' 2 of the jumper and is less than the spacing H 3 between the branches 11 and 11 'of the base 1.
  • Each block 50 1 , 50 2 contains two pairs of parallel conductive sleeves 6 1 -6 ' 1 and 6 2 - 6' 2 , 6 3 - 6 ' 3 and 6 4 - 6' 4 , forming female contacts, which are distributed transversely of a identical to the sleeves of each rider.
  • a jumper such as the jumper 3 1
  • the bottom insertion of the block 50 1 of the associated plug 5 1 between the first branch parts 32 1 and 32 ' 1 is such that the whole of block 30 1 of jumper 3 1 and of block 50 1 of plug 5 1 is completely contained in base 1, the length of block 30 1 of jumper being equal to (L 3 - L 5 ).
  • the male contact pairs 21 1 - 21 ' 1 and 21 2 - 21' 2 pass completely through the pairs of sleeves 4 1 - 4 ' 1 and 4 2 - 4' 2 of the jumper 3 1 and penetrate into the pairs of sleeves 61 - 6'1 and 6 2 - 6 ' 2 of the plug 5 1 respectively, over a length substantially equal to L 5 .
  • the mechanical assembly of the jumper 3 1 , 3 2 with the corresponding plug 5 1 , 5 2 is carried out in a similar manner to the mechanical assembly of the jumper 3 1 , 3 2 with the base 1 so that the plug 5 1 , 5 2 can also be plugged directly into the base 1 as shown in FIG. 4.
  • the male intermediate portion 51 1 , 51 2 of each plug 5 1 , 5 2 has longitudinal and transverse profiles similar to the longitudinal and transverse profiles of the space between the second branch parts 33 1 and 33 ' 1 , 33 2 and 3 3 ' 2 of each jumper and the like to the longitudinal and transverse profiles of the space between the branches 11 and 11 'of the base over a length (L 3 - L 5 ) taken from the edges of the branches 11 and 11'.
  • Each intermediate portion of plug 51 1 , 52 2 has a height equal to H 3 .
  • a longitudinal central blind groove 53 1 , 53 2 shown in short dashed lines in FIG. 1, to receive a jumper tongue 37 1 , 37 2 , or a tongue 12 1 , 12 2 from the base.
  • a transverse groove 54 1 , 54 2 is formed in the upper face of each portion of the plug 51 1 , 51 2 to receive one half of the rear transverse tongue 13 of the base, or possibly a transverse tongue (not shown) under the internal face of a second portion of upper rider branch 33 ′ 1 , 33 ′ 2 according to another variant of rider.
  • each plug 5 1 , 5 2 contains four sheathed conductive wires respectively connected to the four female contacts 6 1 , 6 ' 1 , 6 2 and 6' 2 , 6 3 , 6 ' 3' 6 4 and 6 ' 4 , which exit from the plug through a sheath sleeve 55 1 , 55 2 extending the rear face of the plug.
  • the insulated conductor wires are to be connected to a control and test device on the printed circuit board CI.
  • the rear of the upper face of each card 51 , 5 2 has a shoulder 56 1 , 56 2 , the upper face of which is crenellated transversely in order to facilitate gripping of the card.
  • An assembly of the base 1, a jumper such as the jumper 3 1 and a plug such as the plug 5 1 as shown in FIG. 3 makes it possible to individually test the four printed conductors associated with the corresponding holes T 1 , T ' 1 , T 2 and T' 2 , or preferably, to test connections between the holes T and T ' 1 , T 2 and T ' 2 when the jumper 3 1 has two short circuits between the male contacts 4 1 and 4 ' 1 and between the male contacts 4 2 and 4 ' 2 .
  • Direct assembly of a plug, such as plug 3 1 , and of the base 1 as shown in FIG. 4 makes it possible to individually test the printed conductors associated with the holes T 1 , T ' 1 , T 2 and T' 2 , and in particular to detect breaks in the printed conductors.
  • bases such as base 1
  • Several bases can be juxtaposed along the edge B of the printed circuit board CI to form a connection strip.
  • a base can include more than four pairs of male contacts, and receive more than two jumpers and / or corresponding plugs.
  • a jumper can have more than two pairs of female contacts.
  • a plug can include more than two pairs of female contacts.
  • a socket, a jumper and a plug according to the invention each comprises at least two contacts, such as two male contacts 2 1 and 2 ' 1 , two female contacts 4 1 and 4' 1 and two female contacts 6 1 and 6 ' 1 , respectively.
  • the mechanical coding means between the three elements 1, 3 1 and 5 1 of a connection device according to the invention are reciprocal assemblies of those described above.
  • a longitudinal tongue 12 1 of the base 1 is replaced by a longitudinal groove to receive a longitudinal tongue replacing the groove 34 1 of the jumper 3 1 , or replacing the groove 53 1 of the plug 5 1 ;
  • the transverse tongue 13 of the base 1 is replaced by a transverse groove to receive a longitudinal tongue replacing the groove 35 1 , of the jumper 3 1 , or replacing the groove 54 1 , of the plug 5 1 .

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
EP84402063A 1983-10-14 1984-10-12 Verbinderanordnung zum Testen einer Schaltplatte Expired EP0138713B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8316366A FR2553588B1 (fr) 1983-10-14 1983-10-14 Dispositif de connexion pour test de circuit imprime
FR8316366 1983-10-14

Publications (2)

Publication Number Publication Date
EP0138713A1 true EP0138713A1 (de) 1985-04-24
EP0138713B1 EP0138713B1 (de) 1988-02-24

Family

ID=9293131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84402063A Expired EP0138713B1 (de) 1983-10-14 1984-10-12 Verbinderanordnung zum Testen einer Schaltplatte

Country Status (4)

Country Link
US (1) US4693531A (de)
EP (1) EP0138713B1 (de)
DE (1) DE3469472D1 (de)
FR (1) FR2553588B1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3673391D1 (de) * 1986-03-05 1990-09-13 Weidmueller C A Gmbh Co Mehrpoliger steckverbinder.
FR2631493B1 (fr) * 1988-05-11 1990-07-27 Labinal Dispositif de shuntage pour connecteurs electriques
US4874317A (en) * 1988-08-15 1989-10-17 Switchcraft, Inc. Jackfield with front terminals
FR2687508B1 (fr) * 1992-02-13 1994-11-04 Souriau & Cie Ensemble de connexion entre une carte mere et une carte fille.
US5470795A (en) * 1994-02-25 1995-11-28 Shushurin; Vladimir V. Method of connecting terminals of a plastic-encapsulated power transistor to a printed-circuit board
US6036534A (en) * 1997-02-26 2000-03-14 3M Innovative Properties Company Low profile shunt connector
JP2001015223A (ja) * 1999-06-25 2001-01-19 Nec Corp 汎用コネクタおよびその結合方法
TW486178U (en) * 2001-06-22 2002-05-01 Hon Hai Prec Ind Co Ltd Receptacle connector assembly
US7517235B2 (en) 2006-12-28 2009-04-14 General Electric Company Press fit connection for mounting electrical plug-in outlet insulator to a busway aluminum housing
CN103858284B (zh) 2011-08-08 2016-08-17 莫列斯公司 具有调谐通道的连接器
JP5846586B2 (ja) * 2012-05-14 2016-01-20 アルプス電気株式会社 電子部品用ソケット

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1465785B1 (de) * 1964-05-13 1970-01-15 Krone Kg Trennendverschluss
DE2125858A1 (de) * 1971-05-25 1972-12-07 Licentia Gmbh Zwischenstecker mit äusserer und innerer Kontaktierung
US3745510A (en) * 1971-07-02 1973-07-10 Interdyne Co Printed circuit board/integrated circuit socket combination
DE2315062A1 (de) * 1972-03-29 1973-10-18 Hitachi Ltd Vielfachsteckanschlusstueck
EP0041308A1 (de) * 1980-06-03 1981-12-09 E.I. Du Pont De Nemours And Company Brückenverbinder zum elektrischen Verbinden paralleler Stifte
US4329008A (en) * 1980-04-01 1982-05-11 Braginetz Paul A High density connector module with tri-paddle contact elements

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL255778A (de) * 1959-09-22
IT644916A (de) * 1961-02-21
US3697927A (en) * 1970-10-28 1972-10-10 Amp Inc Electrical connectors and housings therefore
US3771102A (en) * 1971-07-01 1973-11-06 Mallory & Co Inc P R Bussing block
US4034284A (en) * 1975-08-08 1977-07-05 Ideal Industries, Inc. Hand-held wall receptacle wiring tester with oppositely disposed push/pull surfaces for insertion and removal of the tester
IT1094110B (it) * 1977-04-29 1985-07-26 Rau Swf Autozubehoer Dispositivo di fissaggio per interruttori
DE3012239C2 (de) * 1980-03-28 1982-05-27 Siemens AG, 1000 Berlin und 8000 München Steckverbinder
US4431244A (en) * 1980-08-11 1984-02-14 Anhalt John W Electrical connector with integral latch
FR2508721A1 (fr) * 1981-06-30 1982-12-31 Alsthom Cgee Dispositif adaptateur pour connecteur electrique femelle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1465785B1 (de) * 1964-05-13 1970-01-15 Krone Kg Trennendverschluss
DE2125858A1 (de) * 1971-05-25 1972-12-07 Licentia Gmbh Zwischenstecker mit äusserer und innerer Kontaktierung
US3745510A (en) * 1971-07-02 1973-07-10 Interdyne Co Printed circuit board/integrated circuit socket combination
DE2315062A1 (de) * 1972-03-29 1973-10-18 Hitachi Ltd Vielfachsteckanschlusstueck
US4329008A (en) * 1980-04-01 1982-05-11 Braginetz Paul A High density connector module with tri-paddle contact elements
EP0041308A1 (de) * 1980-06-03 1981-12-09 E.I. Du Pont De Nemours And Company Brückenverbinder zum elektrischen Verbinden paralleler Stifte

Also Published As

Publication number Publication date
FR2553588B1 (fr) 1986-01-03
DE3469472D1 (en) 1988-03-31
EP0138713B1 (de) 1988-02-24
US4693531A (en) 1987-09-15
FR2553588A1 (fr) 1985-04-19

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