CA1063690A - Insulation piercing electrical connector - Google Patents
Insulation piercing electrical connectorInfo
- Publication number
- CA1063690A CA1063690A CA250,778A CA250778A CA1063690A CA 1063690 A CA1063690 A CA 1063690A CA 250778 A CA250778 A CA 250778A CA 1063690 A CA1063690 A CA 1063690A
- Authority
- CA
- Canada
- Prior art keywords
- slots
- terminal
- wall
- housing
- 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
Links
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
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
- H01R4/2416—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
- H01R4/2445—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives
- H01R4/245—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives the additional means having two or more slotted flat portions
- H01R4/2454—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives the additional means having two or more slotted flat portions forming a U-shape with slotted branches
Landscapes
- Connector Housings Or Holding Contact Members (AREA)
- Multi-Conductor Connections (AREA)
- Insulators (AREA)
- Installation Of Indoor Wiring (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
Abstract
ABSTRACT
A pair of terminals having wire-receiving slots are mounted in back-to-back relation in an insulating housing having slots aligned with the terminal slots.
The housing slots have resilient constrictions preferably defined by fingers retaining wires in the slots. The connector preferably has a base of reduced width and is moulded onto a carrier strip for automatic feed in wire connecting apparatus.
A pair of terminals having wire-receiving slots are mounted in back-to-back relation in an insulating housing having slots aligned with the terminal slots.
The housing slots have resilient constrictions preferably defined by fingers retaining wires in the slots. The connector preferably has a base of reduced width and is moulded onto a carrier strip for automatic feed in wire connecting apparatus.
Description
r The invention relates to electrical connectors particularly to connectors for splicing corresponding wires of wire pairs together.
An electrical connector according to the invention compri.ses an insulating housing moulded of plastics material with a pair of terminal-receiving cavities opening to opposite ends of the housing, a pair of electxical terminals received in respective cavities in back-to-back relation, each terminal being stamped and formed from a single piece of sheet metal stock with first and second parallel wire-receiving slots spaced apart -laterally of their axes with open axial ends towards ~he cavity opening, so that the terminals face in opposite . -directions away rom each other, first walls of each cavi~y lying in a common plane and each first wall being formed ; .. . .
;~l with.a pair of wire-receiving slots aligned with the . . respective slots of its associated termlnal, with open i axial ends of the terminal slots adjacent ~he cavity openings, longitud1nal.walls de~ining the terminal slots lying in a pla~e parallel to the first wall so that insulated . wires located in straight condltion to extend perpendicular .. : - to the first wall in alignment with the terl~inal slots can ~ . .
: be inserted in strai~ht condition transverse~y of thelx axes i~to ~he respectlve aligned slots through ~he open end, khe : edges o~ ~he terminal slots, penetrating the insulation to ::!
esta~lish an electrical connection wi-th respective wire `I cores~
Examples of connectors according to the invention will now be described with reference to the ~ccompan~ing drawings -` 30 in which:
. , .
: 2 "~ ...
,. - . .
. , , , .. ., , ., ~ . .. . . .. . ~ . ...... . . . .. .
` 5058 '` ~ ~ ' ' Figure 1 is an exploded perspective view of the connector;
Figure 2 is a plan view partly in cross-section taken . . along line 2-2 of Figure l;
: 5 Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2;
Figure 4 is an end view in direction 4-4 of Figure 3;
Figures 5 - 7 are end~views showing stages o insertion o a wire;
Figure 8 is an exploded perspective view of a second ~ example of connectZor; and, ; Figure 9 is a wirLng diagram of a tap connector to ~he second exZample of co~nector-. ~ The connector 10 comprises an insulating housing 11 moulded in one piece of suitable plastics material and two metal terminals 12 mounted as a snug fit in cavities 13 :1 : : .
., formed in opposite ends of the housing.
' Each terminal is of channel section having side~alls provided wi~h spaced pairs of wlre-receiving slots 14 and .20 ` :: . , .~, . .
, -.
,,, j :.~ "
I~- 25 `
~ .
~::
']~ . .
..
'! , : -, :. 3 .~' 3~
15 respectively and an intermediate slot pair 17 permitting independent flexure of the walls of the wire-receiving slots. The wire-receiving slots of each pair are aligned and differ ln wldth to provide a core-; contacting and strain relief function.
Upper and lower sidewalls 19 and 20 of each housing cavity 13are also provided with slots 21 and 22 respectively, aligned with the wire-receiving slots 14 and lS. The upper side walls are relieved at 23 to define resiliently flexible fingers 24 extending obliquely across slots 14 and 15 and having free ends terminating intermediate ends of the slots.
The inner ends 25 of the slots 21 are enlarged and define a necked resil-iently flexible divider 26. The slots 21 diverge at their outer ends pro-viding stepped mouths 27.
The housing base 29 is of reduced width to provide access for wire insertion tooling to each end of the housing.
The connector housing may be manufactured in strip form by eeding a perorated carrier strip 31 of *MYLAR, a suitable plastiGs `
such as *KAPTON, or metal through the mould of a moulding machine and moulding the housings onto the strip, the mould cavities having recesses to permit the flow of moulding meterial through the holes in the carrier so that studs 32 are formed on the underside of the carrier strip. The : .
^ studs securely hold the connectors onto the strip but permit ready release therefrom using the apparatus described in our United States Patent No.
. .
3,975,812 issued August 24, 1976.
` Corresponding wires of wire pairs may be spliced in turn using .~ .
the apparatus described in our above referenced United States Patent~
`'! *Trade mark ~.
, ', ~' :
La~
~, .
Mo. 576,~ (5~59~ As each wire is forced by a ram into the housing 510ts 21, the slot walls defined inter alia by divider 26 and finger 24 are resiliently flexed apart (Figure 6) to permit the wire to enter terminal slots 15 or 16. During insertion, the walls of the slots adJacent the fingers 24 penetrate the insulation to establish , electrical connection with the wire core while the other aligned slots qrlp or penetrate the insulation to provide strain relief. When the wire is fully inserted into the slots, the finger 24 resiles so that its free end overlies the wire retaining it in the slot (Figure 7). The strip can then be indexed forward to splice the next wire of the pair.
~ The connectors can be manufactured in a very small ;~ 15 size, (e.g. 0.5 x .29 x .26 inches~ so that they occupy a :. . .
small volume when splicing a cable. The flexible fingers not only relieve the electrical connection from strain , ~ axially of the slot but also assist in retaining the .~ .termlnals in the housing after connection. As the terminals are retained in the cavities they are insulated from terminals of adjacent connectors when the splices are ~ .
~ bundled toqether after cable connection and the individual ~. .
; wlres of the two spliced pairs are located together which is important for speedy repair. The adaptatlon of the ... .
J 25 connector strip feed enables a larqe number of insu1ated connections to be made automatically hy relatively unskilled ~-; i ~j! operators with little operator fatigue which is very !, advantageous where several thousand indlvidual connections are to be made in spliclng to~ether two telephone cables.
l 30 Manipulation of the ~ires is also facilitated as the wires .-,, ~ 5 :~ .
. ' :
'' . ~ ',.'.' ''': ' '''' ,.'. "., . ,, ' , '.... ' , , ', .: :,' , . ' ~ ' , , ' . . . .
of each pair extendinq from one cable end can be connected simultaneously to the terminals using the above-mentioned apparatus.
A second example of connector, particularly useful for making tap connections is shown in Figure 8. This is of similar construction to the first connsctor bu~ three pairs of wire-receiving slots 35 are provided to achieve the tap connection shown in Figure 9. . , :~
,, ,, ,~ , ,"
.
- 15 . ~:.
., .
.,, ; .
. . ~ . .
:
, ~ ' ' ~, ' .
,` - ' ''- '. ' :' .
.,~ : . .
.
,1, .
. 25 ;',i - .. ~:
,, ' ' ,' , :, . , . ~ ,., ' ' 30 ~`' ' :
: 6 -~ , .
An electrical connector according to the invention compri.ses an insulating housing moulded of plastics material with a pair of terminal-receiving cavities opening to opposite ends of the housing, a pair of electxical terminals received in respective cavities in back-to-back relation, each terminal being stamped and formed from a single piece of sheet metal stock with first and second parallel wire-receiving slots spaced apart -laterally of their axes with open axial ends towards ~he cavity opening, so that the terminals face in opposite . -directions away rom each other, first walls of each cavi~y lying in a common plane and each first wall being formed ; .. . .
;~l with.a pair of wire-receiving slots aligned with the . . respective slots of its associated termlnal, with open i axial ends of the terminal slots adjacent ~he cavity openings, longitud1nal.walls de~ining the terminal slots lying in a pla~e parallel to the first wall so that insulated . wires located in straight condltion to extend perpendicular .. : - to the first wall in alignment with the terl~inal slots can ~ . .
: be inserted in strai~ht condition transverse~y of thelx axes i~to ~he respectlve aligned slots through ~he open end, khe : edges o~ ~he terminal slots, penetrating the insulation to ::!
esta~lish an electrical connection wi-th respective wire `I cores~
Examples of connectors according to the invention will now be described with reference to the ~ccompan~ing drawings -` 30 in which:
. , .
: 2 "~ ...
,. - . .
. , , , .. ., , ., ~ . .. . . .. . ~ . ...... . . . .. .
` 5058 '` ~ ~ ' ' Figure 1 is an exploded perspective view of the connector;
Figure 2 is a plan view partly in cross-section taken . . along line 2-2 of Figure l;
: 5 Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2;
Figure 4 is an end view in direction 4-4 of Figure 3;
Figures 5 - 7 are end~views showing stages o insertion o a wire;
Figure 8 is an exploded perspective view of a second ~ example of connectZor; and, ; Figure 9 is a wirLng diagram of a tap connector to ~he second exZample of co~nector-. ~ The connector 10 comprises an insulating housing 11 moulded in one piece of suitable plastics material and two metal terminals 12 mounted as a snug fit in cavities 13 :1 : : .
., formed in opposite ends of the housing.
' Each terminal is of channel section having side~alls provided wi~h spaced pairs of wlre-receiving slots 14 and .20 ` :: . , .~, . .
, -.
,,, j :.~ "
I~- 25 `
~ .
~::
']~ . .
..
'! , : -, :. 3 .~' 3~
15 respectively and an intermediate slot pair 17 permitting independent flexure of the walls of the wire-receiving slots. The wire-receiving slots of each pair are aligned and differ ln wldth to provide a core-; contacting and strain relief function.
Upper and lower sidewalls 19 and 20 of each housing cavity 13are also provided with slots 21 and 22 respectively, aligned with the wire-receiving slots 14 and lS. The upper side walls are relieved at 23 to define resiliently flexible fingers 24 extending obliquely across slots 14 and 15 and having free ends terminating intermediate ends of the slots.
The inner ends 25 of the slots 21 are enlarged and define a necked resil-iently flexible divider 26. The slots 21 diverge at their outer ends pro-viding stepped mouths 27.
The housing base 29 is of reduced width to provide access for wire insertion tooling to each end of the housing.
The connector housing may be manufactured in strip form by eeding a perorated carrier strip 31 of *MYLAR, a suitable plastiGs `
such as *KAPTON, or metal through the mould of a moulding machine and moulding the housings onto the strip, the mould cavities having recesses to permit the flow of moulding meterial through the holes in the carrier so that studs 32 are formed on the underside of the carrier strip. The : .
^ studs securely hold the connectors onto the strip but permit ready release therefrom using the apparatus described in our United States Patent No.
. .
3,975,812 issued August 24, 1976.
` Corresponding wires of wire pairs may be spliced in turn using .~ .
the apparatus described in our above referenced United States Patent~
`'! *Trade mark ~.
, ', ~' :
La~
~, .
Mo. 576,~ (5~59~ As each wire is forced by a ram into the housing 510ts 21, the slot walls defined inter alia by divider 26 and finger 24 are resiliently flexed apart (Figure 6) to permit the wire to enter terminal slots 15 or 16. During insertion, the walls of the slots adJacent the fingers 24 penetrate the insulation to establish , electrical connection with the wire core while the other aligned slots qrlp or penetrate the insulation to provide strain relief. When the wire is fully inserted into the slots, the finger 24 resiles so that its free end overlies the wire retaining it in the slot (Figure 7). The strip can then be indexed forward to splice the next wire of the pair.
~ The connectors can be manufactured in a very small ;~ 15 size, (e.g. 0.5 x .29 x .26 inches~ so that they occupy a :. . .
small volume when splicing a cable. The flexible fingers not only relieve the electrical connection from strain , ~ axially of the slot but also assist in retaining the .~ .termlnals in the housing after connection. As the terminals are retained in the cavities they are insulated from terminals of adjacent connectors when the splices are ~ .
~ bundled toqether after cable connection and the individual ~. .
; wlres of the two spliced pairs are located together which is important for speedy repair. The adaptatlon of the ... .
J 25 connector strip feed enables a larqe number of insu1ated connections to be made automatically hy relatively unskilled ~-; i ~j! operators with little operator fatigue which is very !, advantageous where several thousand indlvidual connections are to be made in spliclng to~ether two telephone cables.
l 30 Manipulation of the ~ires is also facilitated as the wires .-,, ~ 5 :~ .
. ' :
'' . ~ ',.'.' ''': ' '''' ,.'. "., . ,, ' , '.... ' , , ', .: :,' , . ' ~ ' , , ' . . . .
of each pair extendinq from one cable end can be connected simultaneously to the terminals using the above-mentioned apparatus.
A second example of connector, particularly useful for making tap connections is shown in Figure 8. This is of similar construction to the first connsctor bu~ three pairs of wire-receiving slots 35 are provided to achieve the tap connection shown in Figure 9. . , :~
,, ,, ,~ , ,"
.
- 15 . ~:.
., .
.,, ; .
. . ~ . .
:
, ~ ' ' ~, ' .
,` - ' ''- '. ' :' .
.,~ : . .
.
,1, .
. 25 ;',i - .. ~:
,, ' ' ,' , :, . , . ~ ,., ' ' 30 ~`' ' :
: 6 -~ , .
Claims (6)
1. An electrical connector comprising an insulating housing moulded of plastics material with a pair of terminal-receiving cavities opening to opposite ends of the housing, a pair of electrical terminals received in respective cavities in back-to-back relation, each terminal being stamped and formed from a single piece of sheet metal stock with first and second parallel wire-receiving slots spaced apart laterally of their axes with open axial ends towards the cavity opening, so that the terminals face in opposite.
directions away from each other, first walls of each cavity lying in a common plane and each first wall being formed with a pair of wire-receiving slots aligned with the respective slots of its associated terminal, with open axial ends of the terminal slots adjacent the cavity openings, longitudinal walls defining the terminal slots lying in a plane parallel to the first wall so that insulated wires located in straight condition to extend perpendicular to the first wall in alignment with the terminal slots can be inserted in straight condition transversely of their axes into the respective aligned slots through the open end, the edges of the terminal slots penetrating the insulation to establish an electrical connection with respective wire cores.
directions away from each other, first walls of each cavity lying in a common plane and each first wall being formed with a pair of wire-receiving slots aligned with the respective slots of its associated terminal, with open axial ends of the terminal slots adjacent the cavity openings, longitudinal walls defining the terminal slots lying in a plane parallel to the first wall so that insulated wires located in straight condition to extend perpendicular to the first wall in alignment with the terminal slots can be inserted in straight condition transversely of their axes into the respective aligned slots through the open end, the edges of the terminal slots penetrating the insulation to establish an electrical connection with respective wire cores.
2. An electrical connector according to claim 1 in which the first walls of each cavity have resiliently flexible portions each defining a constriction in a wall slot between opposite ends of each terminal slot, the wall slot portions flexing to admit wires into the respective slots and resiling after admittance of the wires to prevent removal of the wires from the respective slots.
3. An electrical connector according to claim 2 in which the portions defining a constriction each comprise a finger extending obliquely across the terminal slot axis with a root end integral with the remainder of the cavity wall and a free end intermediate the slot ends.
4. An electrical connector according to claim 1 or claim 2 in which the terminal is of channel-section with the first and second slots located in one terminal wall and spaced axially of the channel, the opposite terminal wall and cavity wall both being formed with two wire-receiving slots aligned with each other and with the first and second slots respectively.
5. An electrical connector according to claim 1 in which the housing has a base of reduced width between the housing ends.
6. An electrical connector according to claim 1, claim 2 or claim 5 in which the housing is moulded onto a perforated carrier strip a stud being formed during moulding to extend through the perforation locating the housing on the strip.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57683175A | 1975-05-12 | 1975-05-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1063690A true CA1063690A (en) | 1979-10-02 |
Family
ID=24306192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA250,778A Expired CA1063690A (en) | 1975-05-12 | 1976-04-22 | Insulation piercing electrical connector |
Country Status (17)
| Country | Link |
|---|---|
| JP (1) | JPS51140187A (en) |
| AR (1) | AR210126A1 (en) |
| AT (1) | AT358642B (en) |
| AU (1) | AU502941B2 (en) |
| BE (1) | BE841550A (en) |
| BR (1) | BR7602943A (en) |
| CA (1) | CA1063690A (en) |
| CH (1) | CH603008A5 (en) |
| DE (1) | DE2619558C2 (en) |
| DK (1) | DK151662C (en) |
| FI (1) | FI65149C (en) |
| FR (1) | FR2311423A1 (en) |
| GB (1) | GB1497494A (en) |
| IT (1) | IT1060019B (en) |
| NL (1) | NL185641C (en) |
| NO (1) | NO139906C (en) |
| SE (1) | SE425531B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004780B1 (en) * | 1978-04-10 | 1982-12-01 | AMP INCORPORATED (a New Jersey corporation) | Electrical connector |
| FR2423885A1 (en) * | 1978-04-17 | 1979-11-16 | Bunker Ramo | Electrical connector conductor retainer - has T=shaped slots in rows and columns with corrugated wall inserts |
| US4191442A (en) * | 1978-05-25 | 1980-03-04 | Panduit Corp. | Electrical connector and method of fabricating a wire harness using the connector |
| US4227763A (en) * | 1979-04-09 | 1980-10-14 | Amp Incorporated | Commoning connector |
| US4264117A (en) * | 1979-12-21 | 1981-04-28 | Amp Incorporated | Socket for wedge base incandescent lamp |
| FR2493052B1 (en) * | 1980-10-27 | 1986-04-11 | Molex Inc | ELECTRICAL CONNECTOR PROVIDED WITH MEANS FOR TIGHTENING |
| DE3110144C2 (en) * | 1981-03-16 | 1983-05-19 | Minnesota Mining and Manufacturing Co., 55133 Saint Paul, Minn. | Strain relief for electrical conductors in an electrical connector for non-stripped conductors |
| GB2130815A (en) * | 1982-10-20 | 1984-06-06 | H & T Components Ltd | Electrical connectors |
| DE3622164A1 (en) * | 1986-07-02 | 1988-01-14 | Minnesota Mining & Mfg | HOLDING DEVICE FOR CONNECTING WIRE ON AN ELECTRICAL CONNECTOR |
| US5547391A (en) * | 1993-03-11 | 1996-08-20 | Molex Incorporated | Commoning electrical connector |
| GB2436898A (en) * | 2006-04-03 | 2007-10-10 | Brand Rex Ltd | Insulation displacement connector block with curved pressure applying surface |
| CN109216953B (en) * | 2017-07-04 | 2024-07-16 | 泰科电子(上海)有限公司 | Connector with a plurality of connectors |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3406247A (en) * | 1967-10-09 | 1968-10-15 | Amp Inc | Electrical connections for pairs of conductors |
| US3511921A (en) * | 1968-11-01 | 1970-05-12 | Bell Telephone Labor Inc | Indium coated slotted electrical connectors |
| US3593403A (en) * | 1969-03-14 | 1971-07-20 | Amp Inc | Apparatus for splicing cables containing pairs of conductors |
-
1976
- 1976-04-20 GB GB15830/76A patent/GB1497494A/en not_active Expired
- 1976-04-22 CA CA250,778A patent/CA1063690A/en not_active Expired
- 1976-04-23 NO NO761417A patent/NO139906C/en unknown
- 1976-04-26 IT IT22662/76A patent/IT1060019B/en active
- 1976-04-30 AU AU13511/76A patent/AU502941B2/en not_active Expired
- 1976-05-04 DE DE2619558A patent/DE2619558C2/en not_active Expired
- 1976-05-05 NL NLAANVRAGE7604778,A patent/NL185641C/en not_active IP Right Cessation
- 1976-05-05 AT AT328576A patent/AT358642B/en not_active IP Right Cessation
- 1976-05-06 CH CH571876A patent/CH603008A5/xx not_active IP Right Cessation
- 1976-05-06 BE BE166812A patent/BE841550A/en not_active IP Right Cessation
- 1976-05-10 SE SE7605297A patent/SE425531B/en unknown
- 1976-05-10 AR AR263235A patent/AR210126A1/en active
- 1976-05-11 JP JP51053746A patent/JPS51140187A/en active Pending
- 1976-05-11 FR FR7614156A patent/FR2311423A1/en active Granted
- 1976-05-11 BR BR2943/76A patent/BR7602943A/en unknown
- 1976-05-11 FI FI761325A patent/FI65149C/en not_active IP Right Cessation
- 1976-05-11 DK DK207876A patent/DK151662C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2311423B1 (en) | 1980-05-09 |
| FR2311423A1 (en) | 1976-12-10 |
| AU1351176A (en) | 1977-11-03 |
| NO139906C (en) | 1979-05-30 |
| JPS51140187A (en) | 1976-12-02 |
| BE841550A (en) | 1976-11-08 |
| NL7604778A (en) | 1976-11-16 |
| AR210126A1 (en) | 1977-06-30 |
| DK151662B (en) | 1987-12-21 |
| SE7605297L (en) | 1976-11-13 |
| FI65149C (en) | 1984-03-12 |
| CH603008A5 (en) | 1978-08-15 |
| NL185641B (en) | 1990-01-02 |
| NO761417L (en) | 1976-11-15 |
| NL185641C (en) | 1990-06-01 |
| BR7602943A (en) | 1976-11-23 |
| DE2619558A1 (en) | 1976-12-02 |
| IT1060019B (en) | 1982-07-10 |
| FI65149B (en) | 1983-11-30 |
| GB1497494A (en) | 1978-01-12 |
| DK207876A (en) | 1976-11-13 |
| DE2619558C2 (en) | 1984-06-20 |
| ATA328576A (en) | 1980-02-15 |
| SE425531B (en) | 1982-10-04 |
| NO139906B (en) | 1979-02-19 |
| DK151662C (en) | 1988-08-08 |
| AT358642B (en) | 1980-09-25 |
| AU502941B2 (en) | 1979-08-16 |
| FI761325A (en) | 1976-11-13 |
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