CA1071725A - Dielectric molded plastic self-locking strain relief flexure relief bushing - Google Patents
Dielectric molded plastic self-locking strain relief flexure relief bushingInfo
- Publication number
- CA1071725A CA1071725A CA271,987A CA271987A CA1071725A CA 1071725 A CA1071725 A CA 1071725A CA 271987 A CA271987 A CA 271987A CA 1071725 A CA1071725 A CA 1071725A
- Authority
- CA
- Canada
- Prior art keywords
- opening
- shank
- bushing
- inside diameter
- relief
- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
- H02G3/0616—Joints for connecting tubing to casing
- H02G3/0625—Joints for connecting tubing to casing with means for preventing disengagement of conductors
- H02G3/0633—Joints for connecting tubing to casing with means for preventing disengagement of conductors with means urging the conductors to follow a non-straight line
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Insulating Bodies (AREA)
- Connection Of Plates (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Insulators (AREA)
- Connector Housings Or Holding Contact Members (AREA)
- Installation Of Indoor Wiring (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A molded plastic grip-block and strain relief bushing which is improved by a flare portion through which cable must pass and cannot bend sharply, protecting the cable from flexure stress. The bushing is self lockable in an aperture and com-prises a shank including two portions, one of the shank portions being a gripblock, the shank portions defining an opening to receive cable, and having integral means on at least one shank portion to lock the shank portion engaged in said aperture.
The flared portion distends regularly from an inside diameter of the flared portion opening to an outside diameter, the inside diameter being in the shank, and the outside diameter of the flared portion being spaced away along the longitudinal axis of the bushing from the inside diameter of the opening no less than a distance equal to .25 of said inside diameter of the opening, the outside diameter of the opening being equal to no less than 1.5 times the inside diameter of the opening.
A molded plastic grip-block and strain relief bushing which is improved by a flare portion through which cable must pass and cannot bend sharply, protecting the cable from flexure stress. The bushing is self lockable in an aperture and com-prises a shank including two portions, one of the shank portions being a gripblock, the shank portions defining an opening to receive cable, and having integral means on at least one shank portion to lock the shank portion engaged in said aperture.
The flared portion distends regularly from an inside diameter of the flared portion opening to an outside diameter, the inside diameter being in the shank, and the outside diameter of the flared portion being spaced away along the longitudinal axis of the bushing from the inside diameter of the opening no less than a distance equal to .25 of said inside diameter of the opening, the outside diameter of the opening being equal to no less than 1.5 times the inside diameter of the opening.
Description
~0717ZS
The present invention relates to an improved dielectric molded plastic self-locking strain relief flexure relief bushing.
The demand for effective safe electrical appliances has created a need for strain relief bushings which easily lock into wall apertures and absorb strain at the bushing. Bushings of this sort æe in use today by the multimillions of units.
Another important problem encountered in the use of wire, cord, eable and similar items having flexibility, which may generally be referred to hereinafter as "cable", particularly as used in electrical appliances, has been wear and breakage due to flexure stress and/or abrasion of cable, particularly near an aperture from which cable extend. Past solutions to flexure stress combined with strain relief have been surpris-ingly complicated. They include expensive springs extending from plugs such as in the typical plug of a toaster or an iron, flared extensions from an opening to limit movement and flexure of cable, flexible rubber sheaths in lieu o~ springs on cable extending from electric plugs, and many more.
As effective as strain relief bushings have been, para-doxically, flexure stress has been a prime source of theirfailure. Cable, properly held by a conventional molded self-locking plastic strain relief bushing has traditionally failed after normal use due to flexure stress at the active face of the bushing. For instance, the cable held only by a strain relief bushing in a vacuum cleaner is still subject to flexure and failure at the strain relief bushing after prolonged use due to stress~
Combination strain relief bushings with flexure relief to solve the combined problem of strain relief and flexure stress relief have been expensive, complicated or impracticable.
Com~ination solutions such as engaging a spring in a strain
The present invention relates to an improved dielectric molded plastic self-locking strain relief flexure relief bushing.
The demand for effective safe electrical appliances has created a need for strain relief bushings which easily lock into wall apertures and absorb strain at the bushing. Bushings of this sort æe in use today by the multimillions of units.
Another important problem encountered in the use of wire, cord, eable and similar items having flexibility, which may generally be referred to hereinafter as "cable", particularly as used in electrical appliances, has been wear and breakage due to flexure stress and/or abrasion of cable, particularly near an aperture from which cable extend. Past solutions to flexure stress combined with strain relief have been surpris-ingly complicated. They include expensive springs extending from plugs such as in the typical plug of a toaster or an iron, flared extensions from an opening to limit movement and flexure of cable, flexible rubber sheaths in lieu o~ springs on cable extending from electric plugs, and many more.
As effective as strain relief bushings have been, para-doxically, flexure stress has been a prime source of theirfailure. Cable, properly held by a conventional molded self-locking plastic strain relief bushing has traditionally failed after normal use due to flexure stress at the active face of the bushing. For instance, the cable held only by a strain relief bushing in a vacuum cleaner is still subject to flexure and failure at the strain relief bushing after prolonged use due to stress~
Combination strain relief bushings with flexure relief to solve the combined problem of strain relief and flexure stress relief have been expensive, complicated or impracticable.
Com~ination solutions such as engaging a spring in a strain
2. ~
~07~7Z5 relief bushing still bear the cost of assembly and the cost of the spring. Solutions such as found in U. S. Patent No.
2,72~,736 in a strain relief bushing with an integral molded plastic spring for flexure relief still bear the cost of a large amount of plastic and complicated dies, molds and the difficulty of molding. Almost twenty years after U. S. Patent No. 2,724,736, a simpler, less expensive solution to combined flexure and strain relief was found in U. S. Patent No.
~07~7Z5 relief bushing still bear the cost of assembly and the cost of the spring. Solutions such as found in U. S. Patent No.
2,72~,736 in a strain relief bushing with an integral molded plastic spring for flexure relief still bear the cost of a large amount of plastic and complicated dies, molds and the difficulty of molding. Almost twenty years after U. S. Patent No. 2,724,736, a simpler, less expensive solution to combined flexure and strain relief was found in U. S. Patent No.
3,749,818.
Even U. S. Patent No. 3,749,818 was found to require complicated molds. The webbing used for flexure relief itself has been found subject to some flexure stress and the protrusion for flexure relief was subject to damage from bumping into objects while in use.
Expedients such as the abandoned invention disclosed in Fig. 5 of U. S. Patent No. 3,749,818 were gropings of the prior art toward simplicity and effectiveness in providing combined strain relief and flexure relief in a strain relief bushing by using extending fingers to alter the bending anble of cable.
The fingers of Fig. 5, while promoting benefit, were not effect-ive enough to prevent wear and effective stress relief.
According to the present invention, a molded plastic dielectric strain relief bushing, self lockable in an aperture, is combined with an effective stress relief in the form of an integral regularly flared portion at an active face of the strain relief bushing~
The present invention extends the use life of cable against flexure stress at an active face of a conventional prior art self-locking strain relief bushing whether such bush-ing is in separated sections, or a one-piece bushing of sections joined by webbing or straps.
1~717Z5 The strain relief-flexure relief bushing of the present invention now offers an additional stress relief in what was formerly only a strain relief bushing with only simple addi- ;
tional construc~ion.
The strain relief-fle~ure relief bushing of the present invention substitutes for often conductive flared metal fittings of the past which often had to be screw set and which may or may not have included strain relief characteristics and for the nonconductive stress reliefs which required cable to have sec-ondary strain relief ~acilities.
Although such novel feature or features believed to be characteristic of the invention are pointed out in the claims, the invention and the manner in which it may be carried out may be further understood b~ reference to the description follow-ing and the accompanying drawings.
Fig. 1 is a plan view of a stress relief-flexure relief bushing of the present invention.
Fig. 2 is a front elevation of Fig. 1.
Fig. 3 is a side elevation section of a bushing of Figs. 1 and 2 engaged in an aperture.
Fig. 4 is a side elevation of a bushing of Figs. 1 - 3 engaged with cable in an aperture.
Fig. 5 is a plan view of another embodiment of the stress relief-flexure relief bushing of the present invention.
Fig. 7 is a plan view of another embodiment of the stress relief-flexure relief bushing of the present invention.
Figs. 6 and 8 are details of exemplary bushing locking means for locking bushings in an aperture.
~117~725 Referring now to the figures in greater detail, where like reference numbers denote likeparts in the various figures.
A preferred embodiment of the strain relief-flexure relief bushing 10 of the present invention is shown in Figs. 1
Even U. S. Patent No. 3,749,818 was found to require complicated molds. The webbing used for flexure relief itself has been found subject to some flexure stress and the protrusion for flexure relief was subject to damage from bumping into objects while in use.
Expedients such as the abandoned invention disclosed in Fig. 5 of U. S. Patent No. 3,749,818 were gropings of the prior art toward simplicity and effectiveness in providing combined strain relief and flexure relief in a strain relief bushing by using extending fingers to alter the bending anble of cable.
The fingers of Fig. 5, while promoting benefit, were not effect-ive enough to prevent wear and effective stress relief.
According to the present invention, a molded plastic dielectric strain relief bushing, self lockable in an aperture, is combined with an effective stress relief in the form of an integral regularly flared portion at an active face of the strain relief bushing~
The present invention extends the use life of cable against flexure stress at an active face of a conventional prior art self-locking strain relief bushing whether such bush-ing is in separated sections, or a one-piece bushing of sections joined by webbing or straps.
1~717Z5 The strain relief-flexure relief bushing of the present invention now offers an additional stress relief in what was formerly only a strain relief bushing with only simple addi- ;
tional construc~ion.
The strain relief-fle~ure relief bushing of the present invention substitutes for often conductive flared metal fittings of the past which often had to be screw set and which may or may not have included strain relief characteristics and for the nonconductive stress reliefs which required cable to have sec-ondary strain relief ~acilities.
Although such novel feature or features believed to be characteristic of the invention are pointed out in the claims, the invention and the manner in which it may be carried out may be further understood b~ reference to the description follow-ing and the accompanying drawings.
Fig. 1 is a plan view of a stress relief-flexure relief bushing of the present invention.
Fig. 2 is a front elevation of Fig. 1.
Fig. 3 is a side elevation section of a bushing of Figs. 1 and 2 engaged in an aperture.
Fig. 4 is a side elevation of a bushing of Figs. 1 - 3 engaged with cable in an aperture.
Fig. 5 is a plan view of another embodiment of the stress relief-flexure relief bushing of the present invention.
Fig. 7 is a plan view of another embodiment of the stress relief-flexure relief bushing of the present invention.
Figs. 6 and 8 are details of exemplary bushing locking means for locking bushings in an aperture.
~117~725 Referring now to the figures in greater detail, where like reference numbers denote likeparts in the various figures.
A preferred embodiment of the strain relief-flexure relief bushing 10 of the present invention is shown in Figs. 1
- 4. The strain relief-flexure relief bushing 10 includes a shank 11 and a gripblock 12 joined by a strap 13. The shank 11 and gripblock 12 in effect, functions as a unitary bushing shank. On the face of the shank 11 is a distended portion 14 which may look flared, having an opening 15. A cable 16, as shown in Fig. 4, extends through the opening 15 and is engage- -able in the shank 11 held by the gripblock 12 locked in an aperture 17 in a wall 18. The bushing 10 is self locking, en-gaging the wall in the slots 19, 20 in the gripblock 12 and shank 11, respectively. The opening 15 has an inside diameter A as indicated by the arrows A in Figs. 2 and 3 and a maximum outside diameter B as indicated by the arrows B in Figs. 2 and 3. The lip 21 is on a plane with the outside diameter B. The length L from the co~mencement of the regular distension of the distended portion 14 to the outside diameter is indicated by the arrow L in Fig. 3.
In Fig. 5, one variant preferred embodiment shows a bushing 30 having a shank 31, a gripblock 32, which function together as a unitary shank joined by a strap 33 or webbing, with a distended portion 34 extending from the gripblock 32.
The bushing in closed position is indicated in phantom.
The bushing 50 as shown in Fig. 7 is another preferred variant of the present invention. The bushing 50 includes a sha~k 51, a gripblock 52. A distended portion 53 extends from the shank 51. The shank Sl and gripblock 52 are linked by a strap 55. Aperture grasping fingers 56 extend from the shank 51 for self locking the bushing 50 into an aperture. --"
~7~7~5 In Figs. 6and8, variant self-lock shank camming fingers 61, 62 are shown engaging an aperture 17in wall l~.
In use, a cable 16 is extended through the opening 15 of the distended portion 14 as shown in Figs. 1 - 4. With the gripblock 12 engaged, the bushing 10 may be pushed into the aperture 17. The wall 18 of the aperture 17 cams against the ca~ning surfaces 22, 23, enforcing a strain relief grip on the cable 16. Until the bushing 10 is ultimately locked in the wall 18, engaged in the slots 19, 20, maintaining a strain relief grip on said cable 16.
The cable 16 in normal free movement i5 protected against flexure stress since it cannot bend sharply from the point of exit from the bushing 10 at inside diameter A to the outside diameter B of the distended portion 14. The flexure of the cable 16 at the inside diameter A is relieved by lim~ing the bending of the cable 16 between the inside diameter A and the outside diameter B. The lip 21, while of greater diameter than the outside diameter B, being on a plane with the outside diameter B, has little or no effect on reducing the flexure stress at the inside diameter A.
The regularity of the flaring of the distended portion 14 provides a smooth non-abrasive surface to further protect cable 16.
Where at a minimum, thecutside diameter B of the dis-tended portion 14 is 1.5 larger than the inside diameter A
with a regular distention D as indicated at arrow D in Fig. 3 and where the distance L between the inner diameter A and outside diameter B is no less than .25 of the inner diameter A, flexure tests on cable in an appliance with a strain relief-flexure relief bushing 10 of the present inven~ion for use instandard 120-volt 60-cycle current have shown that such electric 6~
1~717Z5 cable can be flexed over 50,000 cycles at an angle of 180 on a cable length of two to three feet without the cable showing unusual wear or abrasion where such cable extends from such dis-tended portion 14 of a strain relief-flexure relief bushing 10 of the present invention.
Larger dimensions of L and B of course extend the flexure stress life of cable.
The bushings 30, 50 of Figs. 5 and 7 are variants em-ploying distending portions 34, 53 constructed as set forth above.
The bushing 50 as shown in Fig. 7 has fingers 56 illus-trative of variant wall 18 graspinq means. The cam fingers61, 62 of Figs. 6 and 8 are illustrative of further typical wall 18 grasping means on a bushing 10, 30, 50 of the present invention.
The terms and expressions which are employed are used as terms of description; it is recognized, though, that various modifications are possible.
It is also understood the following claims are intended to cover all of the generic and specific features of the in vention which, as a matter of language, might fall therebetween.
.
In Fig. 5, one variant preferred embodiment shows a bushing 30 having a shank 31, a gripblock 32, which function together as a unitary shank joined by a strap 33 or webbing, with a distended portion 34 extending from the gripblock 32.
The bushing in closed position is indicated in phantom.
The bushing 50 as shown in Fig. 7 is another preferred variant of the present invention. The bushing 50 includes a sha~k 51, a gripblock 52. A distended portion 53 extends from the shank 51. The shank Sl and gripblock 52 are linked by a strap 55. Aperture grasping fingers 56 extend from the shank 51 for self locking the bushing 50 into an aperture. --"
~7~7~5 In Figs. 6and8, variant self-lock shank camming fingers 61, 62 are shown engaging an aperture 17in wall l~.
In use, a cable 16 is extended through the opening 15 of the distended portion 14 as shown in Figs. 1 - 4. With the gripblock 12 engaged, the bushing 10 may be pushed into the aperture 17. The wall 18 of the aperture 17 cams against the ca~ning surfaces 22, 23, enforcing a strain relief grip on the cable 16. Until the bushing 10 is ultimately locked in the wall 18, engaged in the slots 19, 20, maintaining a strain relief grip on said cable 16.
The cable 16 in normal free movement i5 protected against flexure stress since it cannot bend sharply from the point of exit from the bushing 10 at inside diameter A to the outside diameter B of the distended portion 14. The flexure of the cable 16 at the inside diameter A is relieved by lim~ing the bending of the cable 16 between the inside diameter A and the outside diameter B. The lip 21, while of greater diameter than the outside diameter B, being on a plane with the outside diameter B, has little or no effect on reducing the flexure stress at the inside diameter A.
The regularity of the flaring of the distended portion 14 provides a smooth non-abrasive surface to further protect cable 16.
Where at a minimum, thecutside diameter B of the dis-tended portion 14 is 1.5 larger than the inside diameter A
with a regular distention D as indicated at arrow D in Fig. 3 and where the distance L between the inner diameter A and outside diameter B is no less than .25 of the inner diameter A, flexure tests on cable in an appliance with a strain relief-flexure relief bushing 10 of the present inven~ion for use instandard 120-volt 60-cycle current have shown that such electric 6~
1~717Z5 cable can be flexed over 50,000 cycles at an angle of 180 on a cable length of two to three feet without the cable showing unusual wear or abrasion where such cable extends from such dis-tended portion 14 of a strain relief-flexure relief bushing 10 of the present invention.
Larger dimensions of L and B of course extend the flexure stress life of cable.
The bushings 30, 50 of Figs. 5 and 7 are variants em-ploying distending portions 34, 53 constructed as set forth above.
The bushing 50 as shown in Fig. 7 has fingers 56 illus-trative of variant wall 18 graspinq means. The cam fingers61, 62 of Figs. 6 and 8 are illustrative of further typical wall 18 grasping means on a bushing 10, 30, 50 of the present invention.
The terms and expressions which are employed are used as terms of description; it is recognized, though, that various modifications are possible.
It is also understood the following claims are intended to cover all of the generic and specific features of the in vention which, as a matter of language, might fall therebetween.
.
Claims (3)
1. A molded dielectric plastic strain relief-flexure relief bushing self lockable in an aperture comprising a shank, said shank including two portions, one said shank portions being a gripblock, said shank portions defining an opening through said shank portions to receive cable, integral means on at least one said shank portion to lock said shank portion engaged in said aperture, said portions interactable in said aperture as cable strain relief means, and internal stress relief means extending from one of said shank portions, said stress relief means comprising a distended portion, said distended portion including an opening, said distended portion distending regularly from an inside diameter of said distended portion opening to an outside diameter of said distended portion opening, said inside diameter being in said shank, said outside diameter of said distended portion opening spaced away along the longitudinal axis of said bushing from said inside diameter of said opening no less than a dis-tance equal to .25 of said inside diameter of said opening, said outside diameter of said opening being equal to no less than 1.5 times said inside diameter of said opening.
2. The invention of claim 1 wherein said outside dia-meter of said distended portion spaced away along the longitu-dinal axis of said bushing from said inside diameter of said opening is a distance of .25 of said inside diameter of said opening, said outside diameter of said opening being equal to 1.5 times said inside diameter of said opening.
3. The invention of claim 1 wherein said portions are joined by webbing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US69714776A | 1976-06-17 | 1976-06-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1071725A true CA1071725A (en) | 1980-02-12 |
Family
ID=24799991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA271,987A Expired CA1071725A (en) | 1976-06-17 | 1977-02-17 | Dielectric molded plastic self-locking strain relief flexure relief bushing |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5314265A (en) |
| AU (1) | AU505426B2 (en) |
| BE (1) | BE855809A (en) |
| CA (1) | CA1071725A (en) |
| DE (1) | DE2714225C2 (en) |
| ES (1) | ES458935A1 (en) |
| FR (1) | FR2355388A1 (en) |
| GB (1) | GB1571344A (en) |
| IT (1) | IT1083862B (en) |
| MX (1) | MX144640A (en) |
| NL (1) | NL7706103A (en) |
| PT (1) | PT66263B (en) |
| SE (1) | SE7706957L (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2116781A (en) * | 1982-03-09 | 1983-09-28 | Tore Georg Palmaer | Cable support |
| JPS6052683U (en) * | 1983-09-16 | 1985-04-13 | 北川工業株式会社 | cord butching |
| GB8511999D0 (en) * | 1985-05-11 | 1985-06-19 | Priory Castor & Eng Co Ltd | Sheet metal fixing |
| DE10122746B4 (en) * | 2001-05-10 | 2005-10-06 | Robert Bosch Gmbh | Anti-kink sleeve for a power cable |
| FR2923329B1 (en) * | 2007-11-05 | 2015-04-24 | Fp2X | DEVICE FOR FITTING AND TRANSFERRING ELECTRIC CABLE FOR TUBULAR ENGINE |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2724736A (en) * | 1953-02-27 | 1955-11-22 | Jr Ferdinand Klumpp | Spring type strain-relief bushing |
| DE1268705B (en) * | 1962-01-17 | 1968-05-22 | Johann Simon | Cable entry with strain relief for housings of electrical devices and machines |
| GB1062080A (en) * | 1964-06-01 | 1967-03-15 | Heyman Mfg Company | Improvements in or relating to strain relief bushing |
| DE6804316U (en) * | 1968-10-28 | 1969-04-24 | Sennheiser Electronic | CABLE GUIDE FOR A MICROPHONE HOUSING |
| US3749818A (en) * | 1971-09-30 | 1973-07-31 | Heyman Mfg Co | Electric cord stress relief combined with a strain relief grommet |
-
1977
- 1977-02-15 AU AU22304/77A patent/AU505426B2/en not_active Expired
- 1977-02-17 CA CA271,987A patent/CA1071725A/en not_active Expired
- 1977-02-22 GB GB7344/77A patent/GB1571344A/en not_active Expired
- 1977-03-03 PT PT66263A patent/PT66263B/en unknown
- 1977-03-16 IT IT21318/77A patent/IT1083862B/en active
- 1977-03-30 DE DE2714225A patent/DE2714225C2/en not_active Expired
- 1977-05-04 MX MX169011A patent/MX144640A/en unknown
- 1977-05-19 ES ES458935A patent/ES458935A1/en not_active Expired
- 1977-06-03 NL NL7706103A patent/NL7706103A/en not_active Application Discontinuation
- 1977-06-09 JP JP6876677A patent/JPS5314265A/en active Granted
- 1977-06-14 FR FR7718161A patent/FR2355388A1/en active Granted
- 1977-06-15 SE SE7706957A patent/SE7706957L/en unknown
- 1977-06-17 BE BE178534A patent/BE855809A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2355388A1 (en) | 1978-01-13 |
| SE7706957L (en) | 1977-12-18 |
| NL7706103A (en) | 1977-12-20 |
| MX144640A (en) | 1981-11-03 |
| FR2355388B1 (en) | 1981-09-18 |
| BE855809A (en) | 1977-10-17 |
| PT66263B (en) | 1978-08-07 |
| AU505426B2 (en) | 1979-11-22 |
| ES458935A1 (en) | 1978-03-01 |
| AU2230477A (en) | 1978-08-24 |
| PT66263A (en) | 1977-04-01 |
| IT1083862B (en) | 1985-05-25 |
| DE2714225A1 (en) | 1977-12-29 |
| GB1571344A (en) | 1980-07-16 |
| JPS5314265A (en) | 1978-02-08 |
| JPS5511813B2 (en) | 1980-03-27 |
| DE2714225C2 (en) | 1983-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |