JPS5694049A - Two stage torsion and vibration damper - Google Patents
Two stage torsion and vibration damperInfo
- Publication number
- JPS5694049A JPS5694049A JP17081780A JP17081780A JPS5694049A JP S5694049 A JPS5694049 A JP S5694049A JP 17081780 A JP17081780 A JP 17081780A JP 17081780 A JP17081780 A JP 17081780A JP S5694049 A JPS5694049 A JP S5694049A
- Authority
- JP
- Japan
- Prior art keywords
- vibration damper
- stage torsion
- torsion
- stage
- damper
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
- F16F15/123—Wound springs
- F16F15/12353—Combinations of dampers, e.g. with multiple plates, multiple spring sets, i.e. complex configurations
- F16F15/1236—Combinations of dampers, e.g. with multiple plates, multiple spring sets, i.e. complex configurations resulting in a staged spring characteristic, e.g. with multiple intermediate plates
- F16F15/12366—Combinations of dampers, e.g. with multiple plates, multiple spring sets, i.e. complex configurations resulting in a staged spring characteristic, e.g. with multiple intermediate plates acting on multiple sets of springs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/1202—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the damping action being at least partially controlled by centrifugal masses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
- F16F15/123—Wound springs
- F16F15/1232—Wound springs characterised by the spring mounting
- F16F15/1234—Additional guiding means for springs, e.g. for support along the body of springs that extend circumferentially over a significant length
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H45/00—Combinations of fluid gearings for conveying rotary motion with couplings or clutches
- F16H45/02—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H45/00—Combinations of fluid gearings for conveying rotary motion with couplings or clutches
- F16H45/02—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type
- F16H2045/0221—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type with damping means
- F16H2045/0226—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type with damping means comprising two or more vibration dampers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H45/00—Combinations of fluid gearings for conveying rotary motion with couplings or clutches
- F16H45/02—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type
- F16H2045/0221—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type with damping means
- F16H2045/0226—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type with damping means comprising two or more vibration dampers
- F16H2045/0231—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type with damping means comprising two or more vibration dampers arranged in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H45/00—Combinations of fluid gearings for conveying rotary motion with couplings or clutches
- F16H45/02—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type
- F16H2045/0273—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type characterised by the type of the friction surface of the lock-up clutch
- F16H2045/0294—Single disk type lock-up clutch, i.e. using a single disc engaged between friction members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Operated Clutches (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10659779A | 1979-12-26 | 1979-12-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5694049A true JPS5694049A (en) | 1981-07-30 |
| JPS627412B2 JPS627412B2 (en) | 1987-02-17 |
Family
ID=22312268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17081780A Granted JPS5694049A (en) | 1979-12-26 | 1980-12-03 | Two stage torsion and vibration damper |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS5694049A (en) |
| AR (1) | AR223563A1 (en) |
| AU (1) | AU533907B2 (en) |
| BR (1) | BR8008483A (en) |
| CA (1) | CA1157398A (en) |
| DE (1) | DE3047039C2 (en) |
| ES (1) | ES498135A0 (en) |
| FR (1) | FR2472693A1 (en) |
| GB (1) | GB2066416B (en) |
| IT (1) | IT1134757B (en) |
| SE (1) | SE443618B (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5934024A (en) * | 1982-07-24 | 1984-02-24 | ル−ク・ラメレン・ウント・クツプルングスバウ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Torsional vibration damper |
| JPS61252964A (en) * | 1985-04-30 | 1986-11-10 | Aisin Warner Ltd | Directly coupled clutch for hydraulic transmission |
| JPS61252961A (en) * | 1985-04-30 | 1986-11-10 | Aisin Warner Ltd | Directly-coupled clutch for hydraulic transmission |
| JPS6375655U (en) * | 1986-11-06 | 1988-05-20 | ||
| JPS6377159U (en) * | 1986-11-10 | 1988-05-23 | ||
| WO1989002551A1 (en) * | 1987-09-11 | 1989-03-23 | Kabushiki Kaisha Daikin Seisakusho | Lockup damper for torque converters |
| JPH0384500U (en) * | 1989-12-20 | 1991-08-27 | ||
| JPH0771527A (en) * | 1986-07-05 | 1995-03-17 | Luk Lamellen & Kupplungsbau Gmbh | Vibration shock absorber |
| JPH0771524A (en) * | 1984-07-07 | 1995-03-17 | Luk Lamellen & Kupplungsbau Gmbh | Absorbing device for rotational shock of internal combustion engine |
| JP2008208855A (en) * | 2007-02-23 | 2008-09-11 | Aisin Aw Industries Co Ltd | Lock-up damper device for torque converter |
| JP2010270893A (en) * | 2009-05-25 | 2010-12-02 | Toyota Motor Corp | Damper device |
| JP2011501066A (en) * | 2007-10-25 | 2011-01-06 | ルーク ラメレン ウント クツプルングスバウ ベタイリグングス コマンディートゲゼルシャフト | Series damper with hysteresis on one damper |
| JP2011075028A (en) * | 2009-09-30 | 2011-04-14 | Aisin Aw Industries Co Ltd | Damper device and power transmission device |
| JP2011117615A (en) * | 2011-03-22 | 2011-06-16 | Aisin Aw Industries Co Ltd | Intermediate support part interposed between damper springs of lockup damper |
| JP2011179557A (en) * | 2010-02-26 | 2011-09-15 | Aisin Aw Industries Co Ltd | Damper device |
| WO2016021668A1 (en) * | 2014-08-05 | 2016-02-11 | アイシン・エィ・ダブリュ株式会社 | Damper device |
| JP2016156384A (en) * | 2015-02-23 | 2016-09-01 | 株式会社エクセディ | Lock-up device of torque converter |
| JP2020180632A (en) * | 2019-04-24 | 2020-11-05 | アイシン精機株式会社 | Damper device |
Families Citing this family (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58106246A (en) * | 1981-12-16 | 1983-06-24 | Atsugi Motor Parts Co Ltd | Tortional vibration damping device |
| JPS58112740U (en) * | 1982-01-27 | 1983-08-02 | 株式会社大金製作所 | Vibration damper assembly |
| DE3218192A1 (en) * | 1982-05-14 | 1983-11-17 | Fichtel & Sachs Ag, 8720 Schweinfurt | Torsional vibration damper, especially for torque converters |
| JPS5958258A (en) * | 1982-09-28 | 1984-04-03 | Daikin Mfg Co Ltd | High gear clutch for torque converter |
| FR2565650B1 (en) * | 1984-06-12 | 1990-04-27 | Luk Lamellen & Kupplungsbau | DEVICE FOR COMPENSATING FOR ROTATION |
| DE3546937C2 (en) * | 1984-06-12 | 2000-07-13 | Luk Lamellen & Kupplungsbau | Torque variation compensator for IC-engine |
| DE3723015A1 (en) * | 1987-07-11 | 1989-01-19 | Daimler Benz Ag | SHARED FLYWHEEL |
| FR2620187B1 (en) * | 1987-09-08 | 1989-12-08 | Valeo | TORSION DAMPING DEVICE, LOCKING CLUTCH FOR HYDROKINETIC COUPLING APPARATUS, PARTICULARLY FOR MOTOR VEHICLE, USING SUCH A TORSION DAMPING DEVICE, AND CORRESPONDING HYDROKINETIC COUPLING APPARATUS |
| FR2660038B1 (en) * | 1990-03-26 | 1994-07-08 | Valeo | DOUBLE SHOCK ABSORBER, IN PARTICULAR FOR MOTOR VEHICLE. |
| DE4128868A1 (en) * | 1991-08-30 | 1993-03-04 | Fichtel & Sachs Ag | TWO-MASS FLYWHEEL WITH SLIDE SHOE |
| FR2683011B1 (en) * | 1991-10-25 | 1993-12-10 | Valeo | TORSION DAMPING DEVICE FOR TORQUE TRANSMISSION APPARATUS. |
| DE19510833C2 (en) * | 1995-03-24 | 1997-01-30 | Fichtel & Sachs Ag | Clutch disc with spring elements connected in series |
| JPH08312751A (en) * | 1995-05-23 | 1996-11-26 | Toyota Motor Corp | Damper device for direct clutch |
| JPH10141472A (en) * | 1996-11-07 | 1998-05-29 | Exedy Corp | Damper mechanism |
| US6224487B1 (en) | 1997-04-02 | 2001-05-01 | Borgwarner Inc. | Two stage torsional vibration damper |
| FR2772862B1 (en) * | 1997-12-23 | 2000-02-04 | Valeo | TORSION SHOCK ABSORBER, IN PARTICULAR FOR A LOCKING CLUTCH OF A HYDROKINETIC COUPLING APPARATUS |
| DE19920542A1 (en) * | 1998-05-06 | 1999-11-18 | Luk Getriebe Systeme Gmbh | Power transmission device for road vehicle |
| JP2000213598A (en) * | 1999-01-25 | 2000-08-02 | Unisia Jecs Corp | Torque transmitting device |
| US6371857B1 (en) | 1999-01-25 | 2002-04-16 | Unisia Jecs Corporation | Torsional vibration dampers |
| DE112007000913A5 (en) | 2006-05-04 | 2009-01-15 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Torque transfer device |
| WO2009015632A1 (en) * | 2007-08-02 | 2009-02-05 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Device for damping vibrations, particularly a multistage torsional vibration damper |
| WO2009015625A1 (en) * | 2007-08-02 | 2009-02-05 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Device for damping torsional vibrations |
| EP2176566B2 (en) | 2007-08-02 | 2023-06-28 | Schaeffler Technologies AG & Co. KG | Power transmission means comprising a hydrodynamic component and a lock-up clutch, and a device for damping vibrations |
| WO2009018794A2 (en) | 2007-08-02 | 2009-02-12 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Device for damping vibrations, in particular a multi-stage torsional vibration damper |
| DE102008032457A1 (en) | 2007-08-02 | 2009-02-05 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Device for damping vibrations |
| DE102007057431B4 (en) | 2007-11-29 | 2018-08-30 | Zf Friedrichshafen Ag | Hydrodynamic coupling device |
| DE102011014941A1 (en) | 2011-03-24 | 2012-09-27 | Schaeffler Technologies AG & Co. KG | Torsional vibration damper has compression springs that are assembled in damper stage which is parallel to circumference arch spring of other damper stage |
| DE102014222003A1 (en) | 2014-10-29 | 2016-05-04 | Voith Patent Gmbh | Device for damping vibrations |
| DE102014226562A1 (en) * | 2014-12-19 | 2016-06-23 | Schaeffler Technologies AG & Co. KG | Rotary vibration damping device |
| FR3058489B1 (en) * | 2016-11-10 | 2019-12-20 | Valeo Embrayages | TORSION DAMPING DEVICE AND MOTOR VEHICLE |
| DE102017112986A1 (en) | 2017-06-13 | 2018-12-13 | Schaeffler Technologies AG & Co. KG | Torsional vibration damper, with laterally arranged pressure spring damper |
| US11525493B2 (en) * | 2019-12-19 | 2022-12-13 | Schaeffler Technologies AG & Co. KG | Torsional vibration damper with centered flanges |
| CN113719552B (en) * | 2021-08-12 | 2023-07-14 | 陕西航天动力高科技股份有限公司 | Clutch assembly |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3101600A (en) * | 1962-02-12 | 1963-08-27 | Borg Warner | Vibration dampeners |
| US4188805A (en) * | 1977-05-31 | 1980-02-19 | Borg-Warner Corporation | Torsional vibration damper |
| CA1105742A (en) * | 1977-05-31 | 1981-07-28 | Don R. Fall | Series spring torsional vibration damper |
| US4138003A (en) * | 1977-08-12 | 1979-02-06 | General Motors Corporation | Vibration damper for a torque converter lock-up clutch |
| US4139995A (en) * | 1977-12-27 | 1979-02-20 | Borg-Warner Corporation | High deflection amplitude torsional vibration damper |
-
1980
- 1980-11-14 CA CA000364721A patent/CA1157398A/en not_active Expired
- 1980-11-14 SE SE8008026A patent/SE443618B/en not_active IP Right Cessation
- 1980-11-20 GB GB8037276A patent/GB2066416B/en not_active Expired
- 1980-11-28 AR AR283422A patent/AR223563A1/en active
- 1980-12-03 JP JP17081780A patent/JPS5694049A/en active Granted
- 1980-12-10 AU AU65239/80A patent/AU533907B2/en not_active Ceased
- 1980-12-13 DE DE3047039A patent/DE3047039C2/en not_active Expired
- 1980-12-17 IT IT26704/80A patent/IT1134757B/en active
- 1980-12-19 FR FR8027157A patent/FR2472693A1/en active Granted
- 1980-12-23 BR BR8008483A patent/BR8008483A/en unknown
- 1980-12-24 ES ES498135A patent/ES498135A0/en active Granted
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5934024A (en) * | 1982-07-24 | 1984-02-24 | ル−ク・ラメレン・ウント・クツプルングスバウ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Torsional vibration damper |
| JPH0444138B2 (en) * | 1982-07-24 | 1992-07-20 | Rutsuku Rameren Unto Kutsupurungusubau Gmbh | |
| JPH0771524A (en) * | 1984-07-07 | 1995-03-17 | Luk Lamellen & Kupplungsbau Gmbh | Absorbing device for rotational shock of internal combustion engine |
| JPS61252964A (en) * | 1985-04-30 | 1986-11-10 | Aisin Warner Ltd | Directly coupled clutch for hydraulic transmission |
| JPS61252961A (en) * | 1985-04-30 | 1986-11-10 | Aisin Warner Ltd | Directly-coupled clutch for hydraulic transmission |
| JPH0771527A (en) * | 1986-07-05 | 1995-03-17 | Luk Lamellen & Kupplungsbau Gmbh | Vibration shock absorber |
| JPS6375655U (en) * | 1986-11-06 | 1988-05-20 | ||
| JPS6377159U (en) * | 1986-11-10 | 1988-05-23 | ||
| JPH0322592Y2 (en) * | 1986-11-10 | 1991-05-16 | ||
| WO1989002551A1 (en) * | 1987-09-11 | 1989-03-23 | Kabushiki Kaisha Daikin Seisakusho | Lockup damper for torque converters |
| US4987980A (en) * | 1987-09-11 | 1991-01-29 | Kabushiki Kaisha Daikin Seisakusho | Lock-up damper device for torque converter |
| JPH0384500U (en) * | 1989-12-20 | 1991-08-27 | ||
| JP2008208855A (en) * | 2007-02-23 | 2008-09-11 | Aisin Aw Industries Co Ltd | Lock-up damper device for torque converter |
| JP2011501066A (en) * | 2007-10-25 | 2011-01-06 | ルーク ラメレン ウント クツプルングスバウ ベタイリグングス コマンディートゲゼルシャフト | Series damper with hysteresis on one damper |
| JP2010270893A (en) * | 2009-05-25 | 2010-12-02 | Toyota Motor Corp | Damper device |
| JP2011075028A (en) * | 2009-09-30 | 2011-04-14 | Aisin Aw Industries Co Ltd | Damper device and power transmission device |
| JP2011179557A (en) * | 2010-02-26 | 2011-09-15 | Aisin Aw Industries Co Ltd | Damper device |
| JP2011117615A (en) * | 2011-03-22 | 2011-06-16 | Aisin Aw Industries Co Ltd | Intermediate support part interposed between damper springs of lockup damper |
| WO2016021668A1 (en) * | 2014-08-05 | 2016-02-11 | アイシン・エィ・ダブリュ株式会社 | Damper device |
| CN106536970A (en) * | 2014-08-05 | 2017-03-22 | 爱信艾达株式会社 | Damper device |
| JPWO2016021668A1 (en) * | 2014-08-05 | 2017-04-27 | アイシン・エィ・ダブリュ株式会社 | Damper device |
| JP2016156384A (en) * | 2015-02-23 | 2016-09-01 | 株式会社エクセディ | Lock-up device of torque converter |
| US10337596B2 (en) | 2015-02-23 | 2019-07-02 | Exedy Corporation | Lock-up device for torque converter |
| JP2020180632A (en) * | 2019-04-24 | 2020-11-05 | アイシン精機株式会社 | Damper device |
Also Published As
| Publication number | Publication date |
|---|---|
| ES8204819A1 (en) | 1982-05-01 |
| SE443618B (en) | 1986-03-03 |
| FR2472693A1 (en) | 1981-07-03 |
| DE3047039A1 (en) | 1981-09-03 |
| AU6523980A (en) | 1982-08-19 |
| BR8008483A (en) | 1981-07-14 |
| ES498135A0 (en) | 1982-05-01 |
| JPS627412B2 (en) | 1987-02-17 |
| DE3047039C2 (en) | 1986-01-23 |
| GB2066416B (en) | 1983-04-07 |
| AR223563A1 (en) | 1981-08-31 |
| IT1134757B (en) | 1986-08-13 |
| AU533907B2 (en) | 1983-12-15 |
| GB2066416A (en) | 1981-07-08 |
| FR2472693B1 (en) | 1984-04-06 |
| SE8008026L (en) | 1981-06-27 |
| IT8026704A0 (en) | 1980-12-17 |
| CA1157398A (en) | 1983-11-22 |
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