EP0321468B1 - Electrical terminal - Google Patents
Electrical terminal Download PDFInfo
- Publication number
- EP0321468B1 EP0321468B1 EP87905130A EP87905130A EP0321468B1 EP 0321468 B1 EP0321468 B1 EP 0321468B1 EP 87905130 A EP87905130 A EP 87905130A EP 87905130 A EP87905130 A EP 87905130A EP 0321468 B1 EP0321468 B1 EP 0321468B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- portions
- limbs
- terminal according
- strip portions
- 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
Links
Images
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
- 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
- H01R12/50—Fixed connections
- H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
- H01R12/65—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures characterised by the terminal
-
- 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
- H01R12/50—Fixed connections
- H01R12/51—Fixed connections for rigid printed circuits or like structures
- H01R12/55—Fixed connections for rigid printed circuits or like structures characterised by the terminals
- H01R12/58—Fixed connections for rigid printed circuits or like structures characterised by the terminals terminals for insertion into holes
- H01R12/585—Terminals having a press fit or a compliant portion and a shank passing through a hole in the printed circuit board
Definitions
- the invention relates to electrical terminals having posts with compliant anchoring portions for force fitting in through-holes in printed circuit boards to connect electrically the terminals to the conductive paths on the printed circuit boards.
- U.S. Patent document 4655537 comprises a post, a portion of which is split longitudinally by shearing to form two limbs which are pushed out in opposite directions parallel to the plane of the shear with their sheared surfaces in partially overlapping condition so that during insertion into the through-hole, the limbs are resiliently forced towards each other with progressive sliding engagement of the sheared surfaces across each other in the plane of the shear further into overlapping engagement.
- Terminals having compliant portions described above have a very high retention force which is desirable when, for example, connection is to be made to the post subsequently by a wire wrapping technique.
- the very high retention force for subsequent wire wrapping is not necessary and the associated disadvantages such as a high insertion force and the problem of distortion of the through-holes together with the manufacturing difficulties arising as a result of the close tolerances to be maintained should be avoided.
- the sheared surfaces may be undesirably rough and irregular, providing an uneven frictional resistance.
- the present invention provides an electrical terminal including a metal post for receipt in an aperture in a printed circuit board and having a compliant portion comprising first and second limbs fixed together at respective opposite ends, having opposed surfaces extending partially overlapping in face-to-face engagement, remote edges of the respective limbs being engageable with the internal periphery of the aperture, during insertion therein, to flex the limbs further together with progressive sliding engagement of the opposed surfaces across each other further into overlapping engagement, characterised in that the limbs are constituted by strip portions with planar, rolled metal, opposed surfaces.
- the resulting insertion forces are lower than with the prior version as the rolled surfaces have a lower coefficient of friction resisting movement of the limbs together during insertion than the sheared surfaces which are relatively rough.
- the limbs undergo essentially plastic deformation rather than the resilient deformation of the prior version maintaining the connection by a wedging action, both factors reducing substantially the risk of damage to through-holes.
- effective connection may be produced without any deformation of the through-hole.
- the opposite ends of the strip portions may be fixed together by clinching or welding.
- the limbs of the compliant portion are formed by bending a metal strip through 180 degrees about a transverse axis extending in its plane to bring the rolled surfaces of the strip portions into the partially overlapping relation and fixing the free ends of the strip portions together by clinching or welding thereby retaining the overlapping surfaces in mutual engagement.
- remote edges of respective strip portions may be coined to present a smooth radius to the through-holes, facilitating receipt therein.
- the remote edge portions are located in mutually parallel relation, offset in laterally opposite directions from a longitudinal medial axis of the strip and extend laterally beyond overlapping portions of the limbs adjacent the fold, being joined thereby to divergent lead-in edges.
- interengageable abutment surfaces are provided on the respective strip portions at locations, for example, on overlapping portions between the fold and the divergent lead-in edges.
- the abutment surfaces may be formed by splitting the individual strip portions in aligned locations along a longitudinal, preferably medial, axis as by shearing, the stock portions on at least one side of the slit of one strip portion and on at least the opposite side of the slit of the other strip portion being pushed in opposite directions towards each other out of the planes of their respective strip portions to present a pair of opposed severed edges which will abut to resist movement together of medial portions of the strip portions.
- both of the stock portions on respective sides of the resulting slits are pushed out of the planes of the respective strip portions in respective opposite directions so that a sheared edge of one strip portion on one side of the slit is located opposite the sheared edge on the other side of the slit in the other strip portion, the pushed-out portion of the one strip portion protruding into an aligned recess in the other strip portion defined by the respective pushed-out portion.
- U.S. 4324451 and U.S. 4066326 Examples of other terminals having compliant portions which are relatively difficult to manufacture are illustrated in U.S. 4324451 and U.S. 4066326.
- EP 45153 discloses a terminal in which interengageable camming portions are provided on opposed folds of a pair of legs for insertion into an aperture in a printed circuit board, while Japanese U.M. 58-14683 discloses a terminal with another different compliant portion.
- the electrical terminal 11 comprises first and second limbs constituted by strip portions 12 and 12', respectively, with respective rolled surfaces 13 and 13', and joined together in face-to-face engagement at respective opposite ends by an integral fold 14 and a pair of ears 15 extending laterally from each edge of one strip portion 12 and clinched along opposite edges of the other strip portion 12'.
- Medial parts 16,16' of respective strips 12,12' are offset in opposite directions in the planes of the strips from the longitudinal medial axis so that their remote edge portions 19,19' respectively extend in mutual parallel relation, and laterally beyond, parts 17,17' of the strip portions adjacent the fold 14 to which they are joined by mutually divergent strip parts 18,18', providing remote lead-in edges 20,20', respectively. This results in the rolled surfaces of the medial parts being partially overlapping and in engagement.
- the terminals are formed from a strip of blanks shown in Figure 5. It will be understood that whilst only the compliant sections are shown in this Figure, various different forms of contact elements may also be incorporated adjacent the carrier 21 according to the desired application of the terminal.
- the terminals can be produced from thin metal stock by a simple stamping and forming technique without the high degree of precision required for accurately shearing a metal post, the terminals are economic to manufacture and, in view of their lower insertion force, economic to assemble with the circuit board.
- the strip blank is formed with creases 30 or waisted at locations adjacent but spaced from the fold, hardening the material to enable the blank to be folded about a predetermined radius to bring the surfaces of the folded portions into engagement without cracking at the fold.
- Abutment surfaces 36,37' for controlling the flexure together, and therefore the insertion force, of the strip portions 32,32' are provided by splitting the individual strip portions in aligned locations along a longitudinal, medial, axis as by shearing, and the stock portions 34,35', 34'35 on both of the respective sides of the resulting slits 33,33' are pushed out of the planes of the respective strip portions 32,32' in respective opposite directions so that a sheared edge 36 of one strip portion 32 on one side of the slit 33 is located opposite the sheared edge 37' on the other side of the slit 33' in the other strip portion 32', the pushed-out portion 34 of one strip portion protruding into an aligned recess 38' in the other strip portion 32' defined by the respective pushed-out portion 34'.
Landscapes
- Coupling Device And Connection With Printed Circuit (AREA)
- Multi-Conductor Connections (AREA)
- Contacts (AREA)
- Organic Insulating Materials (AREA)
- Connections Arranged To Contact A Plurality Of Conductors (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Glass Compositions (AREA)
- Cable Accessories (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
Description
- The invention relates to electrical terminals having posts with compliant anchoring portions for force fitting in through-holes in printed circuit boards to connect electrically the terminals to the conductive paths on the printed circuit boards.
- The use of such terminals is becoming increasingly widespread as they provide a reliable electrical connection to a plated through-hole without a requirement for soldering and securely anchor the terminal in the printed circuit board.
- An example of a widely used terminal of this type is described in U.S. Patent document 4655537 and comprises a post, a portion of which is split longitudinally by shearing to form two limbs which are pushed out in opposite directions parallel to the plane of the shear with their sheared surfaces in partially overlapping condition so that during insertion into the through-hole, the limbs are resiliently forced towards each other with progressive sliding engagement of the sheared surfaces across each other in the plane of the shear further into overlapping engagement.
- Terminals having compliant portions described above have a very high retention force which is desirable when, for example, connection is to be made to the post subsequently by a wire wrapping technique.
- However, for many applications, the very high retention force for subsequent wire wrapping is not necessary and the associated disadvantages such as a high insertion force and the problem of distortion of the through-holes together with the manufacturing difficulties arising as a result of the close tolerances to be maintained should be avoided. In addition, the sheared surfaces may be undesirably rough and irregular, providing an uneven frictional resistance.
- The present invention provides an electrical terminal including a metal post for receipt in an aperture in a printed circuit board and having a compliant portion comprising first and second limbs fixed together at respective opposite ends, having opposed surfaces extending partially overlapping in face-to-face engagement, remote edges of the respective limbs being engageable with the internal periphery of the aperture, during insertion therein, to flex the limbs further together with progressive sliding engagement of the opposed surfaces across each other further into overlapping engagement, characterised in that the limbs are constituted by strip portions with planar, rolled metal, opposed surfaces.
- The resulting insertion forces are lower than with the prior version as the rolled surfaces have a lower coefficient of friction resisting movement of the limbs together during insertion than the sheared surfaces which are relatively rough. In addition, the limbs undergo essentially plastic deformation rather than the resilient deformation of the prior version maintaining the connection by a wedging action, both factors reducing substantially the risk of damage to through-holes. Furthermore, effective connection may be produced without any deformation of the through-hole.
- The opposite ends of the strip portions may be fixed together by clinching or welding.
- In a more specific construction, the limbs of the compliant portion are formed by bending a metal strip through 180 degrees about a transverse axis extending in its plane to bring the rolled surfaces of the strip portions into the partially overlapping relation and fixing the free ends of the strip portions together by clinching or welding thereby retaining the overlapping surfaces in mutual engagement.
- The remote edges of respective strip portions may be coined to present a smooth radius to the through-holes, facilitating receipt therein.
- The remote edge portions are located in mutually parallel relation, offset in laterally opposite directions from a longitudinal medial axis of the strip and extend laterally beyond overlapping portions of the limbs adjacent the fold, being joined thereby to divergent lead-in edges.
- In order to control and limit the flexure together of the limbs and therefore the resistance to insertion, interengageable abutment surfaces are provided on the respective strip portions at locations, for example, on overlapping portions between the fold and the divergent lead-in edges.
- The abutment surfaces may be formed by splitting the individual strip portions in aligned locations along a longitudinal, preferably medial, axis as by shearing, the stock portions on at least one side of the slit of one strip portion and on at least the opposite side of the slit of the other strip portion being pushed in opposite directions towards each other out of the planes of their respective strip portions to present a pair of opposed severed edges which will abut to resist movement together of medial portions of the strip portions.
- Preferably, both of the stock portions on respective sides of the resulting slits are pushed out of the planes of the respective strip portions in respective opposite directions so that a sheared edge of one strip portion on one side of the slit is located opposite the sheared edge on the other side of the slit in the other strip portion, the pushed-out portion of the one strip portion protruding into an aligned recess in the other strip portion defined by the respective pushed-out portion.
- Examples of other terminals having compliant portions which are relatively difficult to manufacture are illustrated in U.S. 4324451 and U.S. 4066326. EP 45153 discloses a terminal in which interengageable camming portions are provided on opposed folds of a pair of legs for insertion into an aperture in a printed circuit board, while Japanese U.M. 58-14683 discloses a terminal with another different compliant portion.
- An example of an electrical terminal including a compliant portion according to the invention will now be described with reference to the accompanying drawings in which:
- Figure 1 is a front elevation of the compliant portion;
- Figure 2 is a side elevation;
- Figure 3 is a cross-sectional view prior to insertion in a through-hole;
- Figure 4 is a similar view after insertion in a plated through-hole;
- Figure 5 is a view of a strip of blanks from which the compliant portions are formed;
- Figure 6 is a perspective view of a second example of the compliant portion; and
- Figure 7 is a transverse cross-sectional view of the second example.
- The
electrical terminal 11 comprises first and second limbs constituted bystrip portions surfaces 13 and 13', and joined together in face-to-face engagement at respective opposite ends by anintegral fold 14 and a pair ofears 15 extending laterally from each edge of onestrip portion 12 and clinched along opposite edges of theother strip portion 12'.Medial parts 16,16' ofrespective strips remote edge portions parts 17,17' of the strip portions adjacent thefold 14 to which they are joined by mutuallydivergent strip parts edges - The terminals are formed from a strip of blanks shown in Figure 5. It will be understood that whilst only the compliant sections are shown in this Figure, various different forms of contact elements may also be incorporated adjacent the
carrier 21 according to the desired application of the terminal. - During insertion, fold first, into a plated through-
hole 22 in a printed circuit board, engagement of theremote edge portions surfaces 13,13' across each other. This provides a desirable controlled dynamic frictional characteristic providing an insertion force which progressively increases as the area of contact increases. The strip portions undergo progressive plastic deformation during insertion so that the residual spring force on the through-hole is relatively small, but progressive collapse and the resulting wedging action produces and maintains intimate engagement of the rollededges - As the terminals can be produced from thin metal stock by a simple stamping and forming technique without the high degree of precision required for accurately shearing a metal post, the terminals are economic to manufacture and, in view of their lower insertion force, economic to assemble with the circuit board.
- In a second example, shown in Figures 6 and 7, the strip blank is formed with
creases 30 or waisted at locations adjacent but spaced from the fold, hardening the material to enable the blank to be folded about a predetermined radius to bring the surfaces of the folded portions into engagement without cracking at the fold.Abutment surfaces 36,37' for controlling the flexure together, and therefore the insertion force, of thestrip portions 32,32' are provided by splitting the individual strip portions in aligned locations along a longitudinal, medial, axis as by shearing, and thestock portions 34,35', 34'35 on both of the respective sides of the resultingslits 33,33' are pushed out of the planes of therespective strip portions 32,32' in respective opposite directions so that asheared edge 36 of onestrip portion 32 on one side of theslit 33 is located opposite the sheared edge 37' on the other side of the slit 33' in the other strip portion 32', the pushed-outportion 34 of one strip portion protruding into an aligned recess 38' in the other strip portion 32' defined by the respective pushed-out portion 34'.
Claims (9)
- An electrical terminal (11) including a metal post for receipt in an aperture (22) in a printed circuit board and having a compliant portion comprising first and second limbs (12,12'; 32,32') fixed together at respective opposite ends, having opposed surfaces (13,13') extending partially overlapping in face-to-face engagement, remote edges (19,19') of the respective limbs (12,12') being engageable with the internal periphery of the aperture (22), during insertion therein, to flex the limbs (12,12') further together with progressive sliding engagement of the opposed surfaces (13,13') across each other further into overlapping engagement, characterised in that:
the limbs (12,12') are constituted by strip portions (12,12') with planar, rolled metal, opposed surfaces (13,13'). - A terminal according to claim 1, characterised in that the limbs (12,12'; 32,32') of the compliant portion are formed by bending a metal strip through 180 degrees about a transverse axis extending in its plane to bring the rolled surfaces (13,13') of the strip portions (12,12'; 32,32') into partially overlapping relation and fixing the free ends of the strip portions (12,12'; 32,32') together.
- A terminal according to claim 1 or claim 2, characterised in that ends of the strip portions (12,12') are fixed together by clinching.
- A terminal according to claim 1 or claim 2, characterised in that ends of the strip portions (12,12') are fixed together by welding.
- A terminal according to any one of the preceding claims, characterised in that the remote edge portions (19,19') are located in mutually parallel relation offset in laterally opposite directions from a longitudinal medial axis of the strip and extend laterally beyond overlapping portions of the limbs (12,12'; 32,32') adjacent the fold (14), being joined thereto by divergent lead-in edges (20).
- A terminal according to any one of the preceding claims, characterised in that abutment surfaces (36,37') are provided on the respective strip portions (12,12'; 32,32') on overlapping portions between the fold (14) and the divergent lead-in edges (20), such surfaces being interengageable to limit the flexure together of the limbs (12,12'; 32,32').
- A terminal according to claim 6, characterised in that the abutment surfaces (36,37') are formed by splitting the individual strip portions (32,32') in aligned locations along a longitudinal axis, stock portions (34,34') on at least one side of the slit (33) of one strip portion (32) and on at least the opposite side of the slit (33') of the other strip portion (32') being pushed in opposite directions towards each other out of the planes of their respective strip portions (32,32') to present a pair of opposed severed edges (36,37') which will abut to resist movement together of medial portions of the strip portions (32,32').
- A terminal according to claim 7, characterised in that both of the stock portions (34,35'; 34',35) on respective sides of the resulting slits (33,33') are pushed out of the planes of the respective strip portions (32,32') in respective opposite directions so that a sheared edge (36) of one strip portion (32) on one side of the slit (33) is located opposite the sheared edge (37') on the other side of the slit (33') in the other strip portion (32'), the pushed-out portion (34) of one strip portion (32) protruding into an aligned recess (38') in the other strip portion (32') defined by the respective pushed-out portion (34').
- An electrical terminal according to any one of claims 1 to 8, characterised in that medial parts (16,16') of respective strips (12,12' or 32,32') are offset in opposite directions in the planes of the strips from the longitudinal medial axis so that the remote edge portions (19,19') respectively extend laterally beyond parts (17,17') of the strip portions.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87905130T ATE87130T1 (en) | 1986-09-01 | 1987-07-29 | ELECTRICAL FINAL LINK. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB868621075A GB8621075D0 (en) | 1986-09-01 | 1986-09-01 | Stamped & formed compliant pin |
GB8621075 | 1986-09-01 | ||
GB878706264A GB8706264D0 (en) | 1987-03-17 | 1987-03-17 | Stamped & formed compliant pin |
GB8706264 | 1987-03-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0321468A1 EP0321468A1 (en) | 1989-06-28 |
EP0321468B1 true EP0321468B1 (en) | 1993-03-17 |
Family
ID=26291236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87905130A Expired - Lifetime EP0321468B1 (en) | 1986-09-01 | 1987-07-29 | Electrical terminal |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0321468B1 (en) |
JP (1) | JPH0626156B2 (en) |
KR (1) | KR930006029B1 (en) |
CN (1) | CN87106058A (en) |
AT (1) | ATE87130T1 (en) |
DE (1) | DE3784938T2 (en) |
DK (1) | DK168259B1 (en) |
ES (1) | ES2008193A6 (en) |
FI (1) | FI91815C (en) |
NO (1) | NO175757C (en) |
WO (1) | WO1988001795A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6352436B1 (en) * | 2000-06-29 | 2002-03-05 | Teradyne, Inc. | Self retained pressure connection |
US6616459B2 (en) * | 2001-08-24 | 2003-09-09 | Adc Telecommunications, Inc. | Card edge contact including compliant end |
US6511330B1 (en) | 2001-08-24 | 2003-01-28 | Adc Telecommunications, Inc. | Interconnect module |
US6830465B2 (en) | 2001-08-24 | 2004-12-14 | Adc Telecommunications, Inc. | Interconnect chassis and module |
CN106410441A (en) * | 2016-07-29 | 2017-02-15 | 南京康尼精密机械有限公司 | Electric plugging pair |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1029105A (en) * | 1973-08-01 | 1978-04-04 | Amp Incorporated | Electrical contact pin for printed circuit board |
JPS5163460A (en) * | 1974-10-10 | 1976-06-01 | Du Pont | Kairobanpin oyobi hoho |
US4324451A (en) * | 1979-11-19 | 1982-04-13 | Elfab Corporation | Card edge connector with pull through bellows contact and lay-over insulator |
JPS5918463B2 (en) * | 1980-03-04 | 1984-04-27 | トヨタ自動車株式会社 | Wear-resistant sintered alloy and its manufacturing method |
EP0134094B1 (en) * | 1983-08-15 | 1987-05-27 | AMP INCORPORATED (a New Jersey corporation) | An improved compliant section for circuit board contact elements |
-
1987
- 1987-07-29 WO PCT/US1987/001810 patent/WO1988001795A1/en active IP Right Grant
- 1987-07-29 AT AT87905130T patent/ATE87130T1/en not_active IP Right Cessation
- 1987-07-29 EP EP87905130A patent/EP0321468B1/en not_active Expired - Lifetime
- 1987-07-29 JP JP62504603A patent/JPH0626156B2/en not_active Expired - Lifetime
- 1987-07-29 KR KR1019880700471A patent/KR930006029B1/en not_active IP Right Cessation
- 1987-07-29 DE DE8787905130T patent/DE3784938T2/en not_active Expired - Lifetime
- 1987-08-28 CN CN198787106058A patent/CN87106058A/en active Pending
- 1987-08-31 ES ES8702524A patent/ES2008193A6/en not_active Expired
-
1988
- 1988-04-28 DK DK234288A patent/DK168259B1/en not_active IP Right Cessation
- 1988-04-29 NO NO881880A patent/NO175757C/en not_active IP Right Cessation
-
1989
- 1989-02-28 FI FI890942A patent/FI91815C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
NO175757C (en) | 1994-11-30 |
KR880701981A (en) | 1988-11-07 |
FI91815B (en) | 1994-04-29 |
DK234288D0 (en) | 1988-04-28 |
WO1988001795A1 (en) | 1988-03-10 |
FI890942A0 (en) | 1989-02-28 |
JPH0626156B2 (en) | 1994-04-06 |
NO175757B (en) | 1994-08-22 |
NO881880L (en) | 1988-06-29 |
CN87106058A (en) | 1988-03-16 |
FI890942A (en) | 1989-02-28 |
JPH01503821A (en) | 1989-12-21 |
NO881880D0 (en) | 1988-04-29 |
DE3784938D1 (en) | 1993-04-22 |
KR930006029B1 (en) | 1993-07-01 |
EP0321468A1 (en) | 1989-06-28 |
ATE87130T1 (en) | 1993-04-15 |
DK234288A (en) | 1988-04-28 |
DK168259B1 (en) | 1994-02-28 |
FI91815C (en) | 1994-08-10 |
ES2008193A6 (en) | 1989-07-16 |
DE3784938T2 (en) | 1993-06-24 |
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