FR2411341A1 - Suspension oleopneumatique a orifices de laminage variables, notamment pour trains d'atterrissage d'aerodynes - Google Patents
Suspension oleopneumatique a orifices de laminage variables, notamment pour trains d'atterrissage d'aerodynesInfo
- Publication number
- FR2411341A1 FR2411341A1 FR7737408A FR7737408A FR2411341A1 FR 2411341 A1 FR2411341 A1 FR 2411341A1 FR 7737408 A FR7737408 A FR 7737408A FR 7737408 A FR7737408 A FR 7737408A FR 2411341 A1 FR2411341 A1 FR 2411341A1
- Authority
- FR
- France
- Prior art keywords
- orifices
- suspension
- piston
- cylinder
- section
- 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
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/346—Throttling passages in the form of slots arranged in cylinder walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
- B60G15/08—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring
- B60G15/12—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring and fluid damper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface
- B64C25/58—Arrangements or adaptations of shock-absorbers or springs
- B64C25/60—Oleo legs
-
- 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
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
- F16F9/486—Arrangements for providing different damping effects at different parts of the stroke comprising a pin or stem co-operating with an aperture, e.g. a cylinder-mounted stem co-operating with a hollow piston rod
Abstract
L'INVENTION CONCERNE UNE SUSPENSION OLEOPNEUMATIQUE A ORIFICES DE LAMINAGE VARIABLES. LA SUSPENSION COMPORTE UNE TIGE 1 RENFERMANT UN RESSORT PNEUMATIQUE 2 ET SOLIDAIRE D'UN PISTON 4 COULISSANT DANS UN CYLINDRE 3, AINSI QUE DEUX CLAPETS 6 ET 7 A ORIFICES PERMANENTS DE LAMINAGE, LE CLAPET 6, DE PLUS GRANDE SECTION, LAMINANT EN COMPRESSION, ET LE CLAPET 7, DE PLUS PETITE SECTION, EN DETENTE, LA SUSPENSION COMPRENANT, DE PLUS, UN DISPOSITIF DE LAMINAGE A ORIFICE DE SECTION VARIABLE EN FONCTION DE LA POSITION ET DU SENS DU DEPLACEMENT DU PISTON 4 DANS LE CYLINDRE 3 DE SORTE QUE, SUR UNE COURSE DONNEE AUTOUR D'UNE POSITION D'EQUILIBRE DETERMINEE, LES ORIFICES ASSURANT LE LAMINAGE EN COMPRESSION ET EN DETENTE SONT D'UNE SECTION RESPECTIVEMENT SUPERIEURE A CELLE DES ORIFICES CORRESPONDANTS SUR LE RESTE DE LA COURSE DU PISTON 4 DANS LE CYLINDRE 3. APPLICATION A L'EQUIPEMENT DE TRAINS D'ATTERRISSAGE OU DE ROULEMENTS DE VEHICULES AERIENS OU TERRESTRES ET AUX MOYENS D'ESSAIS.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7737408A FR2411341A1 (fr) | 1977-12-12 | 1977-12-12 | Suspension oleopneumatique a orifices de laminage variables, notamment pour trains d'atterrissage d'aerodynes |
CA317,092A CA1113971A (fr) | 1977-12-12 | 1978-11-29 | Suspension oleopneumatique a orifices de laminages variables, notamment pour trains d'atterrissage d'aerodynes |
IT12895/78A IT1104406B (it) | 1977-12-12 | 1978-12-07 | Sospensione oleopneumatica a orifici di lamina ione variabili particolarmente per carrelli di atterraggio di aerodine |
GB7847809A GB2011018B (en) | 1977-12-12 | 1978-12-08 | Oleopneumatic suspension with variable throttle orifices especially for aircraft landing gear |
DE7836776U DE7836776U1 (de) | 1977-12-12 | 1978-12-12 | Hydropneumatisch« Federungsvorrichtung |
DE19782853589 DE2853589A1 (de) | 1977-12-12 | 1978-12-12 | Hydropneumatische federung |
US06/285,790 US4405119A (en) | 1977-12-12 | 1981-07-22 | Oleopneumatic suspension with variable throttle orifices, especially for aircraft landing gear |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7737408A FR2411341A1 (fr) | 1977-12-12 | 1977-12-12 | Suspension oleopneumatique a orifices de laminage variables, notamment pour trains d'atterrissage d'aerodynes |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2411341A1 true FR2411341A1 (fr) | 1979-07-06 |
FR2411341B1 FR2411341B1 (fr) | 1983-01-14 |
Family
ID=9198746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7737408A Granted FR2411341A1 (fr) | 1977-12-12 | 1977-12-12 | Suspension oleopneumatique a orifices de laminage variables, notamment pour trains d'atterrissage d'aerodynes |
Country Status (6)
Country | Link |
---|---|
US (1) | US4405119A (fr) |
CA (1) | CA1113971A (fr) |
DE (2) | DE7836776U1 (fr) |
FR (1) | FR2411341A1 (fr) |
GB (1) | GB2011018B (fr) |
IT (1) | IT1104406B (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2461852A1 (fr) * | 1979-07-17 | 1981-02-06 | Messier Hispano Sa | Perfectionnements aux amortisseurs et amortisseurs-verins notamment pour trains d'atterrissage d'aerodyne |
EP0129161A1 (fr) * | 1983-06-17 | 1984-12-27 | Hr Textron Inc. | Amortisseur pour train d'atterissage d'avion |
Families Citing this family (63)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2448662A1 (fr) * | 1979-02-06 | 1980-09-05 | Messier Hispano Bugatti Sa | Perfectionnements aux amortisseurs et amortisseur-verins notamment pour trains d'atterrissage d'aerodyne |
US4787486A (en) * | 1986-06-19 | 1988-11-29 | Pneumo Abex Corporation | Landing gear mechanism including controlled instroke and rebound damping and stroke overload protection |
US4736931A (en) * | 1986-10-03 | 1988-04-12 | Christopherson Rollin F | Dampening shock absorber |
US4756512A (en) * | 1986-12-15 | 1988-07-12 | Miner Enterprises, Inc. | Heavy off-road large vehicle suspension strut |
US4877223A (en) * | 1988-09-21 | 1989-10-31 | Jeffrey K. Hackett | Load leveling shock absorber |
US4935985A (en) * | 1989-05-25 | 1990-06-26 | John Wang | Return apparatus |
EP0425885B1 (fr) * | 1989-10-28 | 1994-07-20 | HEMSCHEIDT FAHRWERKTECHNIK GmbH & Co. | Système à ressort hydropneumatique |
DE4008831C2 (de) * | 1990-03-20 | 1993-11-25 | Hemscheidt Maschf Hermann | Hydropneumatisches Federungssystem |
US5454550A (en) * | 1994-08-09 | 1995-10-03 | Christopherson Group | Dampening shock absorber |
US5566794A (en) * | 1994-09-02 | 1996-10-22 | Ace Controls, Inc. | Shock absorber having nonadjustable metering |
SE512020C2 (sv) * | 1995-05-18 | 2000-01-17 | Oehlins Racing Ab | Anordning vid stötdämpare |
DE19530191A1 (de) * | 1995-08-17 | 1997-02-20 | Daimler Benz Ag | Pleuelstange |
US5893436A (en) * | 1996-01-16 | 1999-04-13 | Tenneco Automotive Inc. | One piece aluminum pressure tube with rod guide for shock absorbers |
US5779007A (en) * | 1996-07-22 | 1998-07-14 | Trw Inc. | Shock absorber with hydraulic fluid control rod |
US5957252A (en) * | 1996-08-02 | 1999-09-28 | Berthold; Brian D. | Hydraulic suspension unit |
US6079725A (en) * | 1997-07-24 | 2000-06-27 | Iron Horse Productions, Inc. | Folding wheelchair with improved suspension system |
US5961106A (en) * | 1998-06-08 | 1999-10-05 | Shaffer; Theodore E. | Vehicle shock absorber assembly having height adjustment |
IT1309773B1 (it) * | 1999-09-30 | 2002-01-30 | Mauro Corradini | Ammortizzatore idraulico ad effetto frenante progressivo. |
US6648310B2 (en) * | 2000-05-30 | 2003-11-18 | Sachs Race Engineering Gmbh | Shock absorber |
US6352271B1 (en) | 2000-07-12 | 2002-03-05 | Daniel A. Babcock | Cylinder for improving the handling of a vehicle in turns |
US6340153B1 (en) | 2000-11-02 | 2002-01-22 | General Dynamics Advanced Technology Systems, Inc. | Shock and acoustic mount |
DE10101177C1 (de) * | 2001-01-12 | 2002-08-29 | Zf Sachs Ag | Teleskop-Schwingungsdämpfer |
DE10122729B4 (de) * | 2001-05-10 | 2006-04-20 | Dt Swiss Ag | Feder-Dämpfersystem für Fahrräder |
US6561325B2 (en) | 2001-07-19 | 2003-05-13 | Dana Corporation | Vehicle suspension with remote spring |
DE10207471B4 (de) * | 2002-02-21 | 2005-09-08 | Thyssenkrupp Bilstein Gmbh | Hydraulischer Schwingungsdämpfer |
US6648311B2 (en) | 2002-03-27 | 2003-11-18 | Pentastar Aviation, Inc. | Assembly and method of exercising an airplane landing gear strut |
US8464850B2 (en) | 2006-11-16 | 2013-06-18 | Fox Factory, Inc. | Gas spring curve control in an adjustable-volume gas-pressurized device |
US7703585B2 (en) | 2002-06-25 | 2010-04-27 | Fox Factory, Inc. | Integrated and self-contained suspension assembly having an on-the-fly adjustable air spring |
US20080296814A1 (en) | 2002-06-25 | 2008-12-04 | Joseph Franklin | Gas spring with travel control |
US10941828B2 (en) | 2002-06-25 | 2021-03-09 | Fox Factory, Inc. | Gas spring with travel control |
US7963509B2 (en) | 2007-01-31 | 2011-06-21 | Fox Factory, Inc. | Travel control for a gas spring and gas spring having very short travel modes |
DE10300732A1 (de) * | 2003-01-11 | 2004-07-22 | Alfit Ag | Vorrichtung zur Dämpfung bzw. Abbremsung von beweglichen Möbelteilen von Möbelstücken |
US7299907B2 (en) * | 2005-01-24 | 2007-11-27 | Ace Controls, Inc. | Hydraulic shock absorber and method |
US20070158601A1 (en) * | 2006-01-10 | 2007-07-12 | Carterone, Llc Organized In: State Of Nevada | Rod Type Mechanical Valve for Fluid Flow Control |
DE102006010245A1 (de) * | 2006-03-02 | 2007-09-06 | Gustav Magenwirth Gmbh & Co. Kg | Federwegsverstellung |
AU2007200182A1 (en) * | 2007-01-17 | 2008-07-31 | Horlock, Nick | Improvements in or relating to suspension systems |
US8162112B2 (en) | 2007-02-09 | 2012-04-24 | Competition Tire East | Methods and apparatus for protecting a shock absorber from bottoming |
FR2917371B1 (fr) * | 2007-06-15 | 2009-11-20 | Messier Dowty Sa | Amortisseur pour atterisseur d'aeronef |
US8246302B2 (en) * | 2007-09-06 | 2012-08-21 | Hamilton Sundstrand Corporation | Teeter-restraint device for wind turbines |
FR2922286B1 (fr) | 2007-10-11 | 2014-02-21 | Eurocopter France | Amortisseur d'un vehicule |
WO2010011635A2 (fr) * | 2008-07-21 | 2010-01-28 | Goodrich Corporation | Jambe d’amortisseur à décharge de pression |
US8087610B2 (en) * | 2009-01-22 | 2012-01-03 | Goodrich Corporation | Aircraft shock strut having fixed upper bearing |
US9056650B2 (en) * | 2009-06-15 | 2015-06-16 | Trek Bicycle Corporation | Bicycle shock assemblies with plunger operated valve arrangement |
JP5180153B2 (ja) | 2009-06-23 | 2013-04-10 | カヤバ工業株式会社 | エアバネ構造 |
GB2474645A (en) * | 2009-10-20 | 2011-04-27 | Messier Dowty Ltd | Aicraft landing gear |
CN101898636B (zh) * | 2010-07-19 | 2012-12-26 | 哈尔滨飞机工业集团有限责任公司 | 一种抗坠毁起落架缓冲支柱吸能结构 |
ES2358664B8 (es) * | 2010-10-29 | 2013-05-21 | Azol-Gas, S.L | Mecanismo de retardo de vástago de un resorte de gas. |
US8899560B2 (en) * | 2011-02-16 | 2014-12-02 | Elite Suspension Systems, Llc | Springless combination shock absorber and suspension apparatus, and method of use |
CN103231801A (zh) * | 2013-04-24 | 2013-08-07 | 哈尔滨飞机工业集团有限责任公司 | 一种抗坠毁起落架缓冲支柱吸能结构 |
GB2510208B (en) * | 2013-04-25 | 2014-12-10 | Messier Dowty Ltd | Actuator |
US9061759B2 (en) * | 2013-11-13 | 2015-06-23 | Goodrich Corporation | Cam-operated bi-directional shock absorber damper |
FR3015427B1 (fr) * | 2013-12-19 | 2016-01-29 | Airbus Operations Sas | Train d'atterrissage pour un aeronef |
CN103738136B (zh) * | 2014-01-27 | 2017-02-15 | 徐州重型机械有限公司 | 独立悬架系统及具有该独立悬架系统的起重机 |
JP6129780B2 (ja) * | 2014-04-30 | 2017-05-17 | センクシア株式会社 | 油圧式ダンパ |
EP3091248B1 (fr) * | 2015-05-07 | 2019-07-03 | Safran Landing Systems UK Limited | Amortisseur hydraulique |
PL3187748T3 (pl) | 2015-12-29 | 2020-01-31 | Dellner Dampers Ab | Amortyzator hydrauliczny tłumiący odrzut do sprzęgu pociągu |
CN108082459B (zh) * | 2016-11-21 | 2023-12-15 | 成都天府新区光启未来技术研究院 | 起落架及飞行器 |
CN108625107B (zh) * | 2017-03-20 | 2021-07-06 | 重庆海尔滚筒洗衣机有限公司 | 减震器和包括该减震器的洗衣机 |
DE102017207690A1 (de) * | 2017-05-08 | 2018-11-08 | Deere & Company | Federbein für ein Fahrzeugfederungssystem |
US10612617B2 (en) * | 2018-01-02 | 2020-04-07 | Goodrich Corporation | Shock strut percolation |
DE102018106157A1 (de) * | 2018-03-16 | 2019-09-19 | Voith Patent Gmbh | Vorrichtung zum Abdämpfen von Druckkräften |
US11396344B2 (en) * | 2018-10-26 | 2022-07-26 | Fox Factory, Inc. | Bushing bypass |
CN113217572B (zh) * | 2020-05-27 | 2022-09-27 | 北京京西重工有限公司 | 阻尼器组件 |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR948387A (fr) * | 1947-06-05 | 1949-07-29 | Siam | Perfectionnements aux amortisseurs à compression de liquide |
FR60568E (fr) * | 1950-01-13 | 1954-11-09 | Amortisseur hydraulique d'oscillation à résistance prédéterminée pour chaque amplitude d'oscillation | |
DE920534C (de) * | 1942-08-26 | 1954-11-25 | Hemscheidt Maschf Hermann | Hydraulischer Schwingungsadaempfer, insbesondere fuer Kraftfahrzeuge |
LU39567A1 (fr) * | 1960-12-21 | 1961-04-21 | ||
DE1184223B (de) * | 1960-04-01 | 1964-12-23 | Fichtel & Sachs Ag | Hydropneumatische Abfederung mit Daempfung und Niveauregelung, insbesondere fuer Kraftfahrzeuge |
FR1402818A (fr) * | 1963-04-13 | 1965-06-18 | Dispositifs d'asservissement, de régulation, d'arrêt, de commande de débits volumétriques ou de mouvements par l'emploi de cames hydrauliques et d'orifices calibrés | |
US3367453A (en) * | 1965-10-13 | 1968-02-06 | Pneumo Dynamics Corp | Bi-directional metering shock absorber |
US3451510A (en) * | 1968-01-22 | 1969-06-24 | Pneumo Dynamics Corp | Metering shock absorber with snubbing means and snub release means |
FR2079874A5 (fr) * | 1970-02-16 | 1971-11-12 | Federspiel Jean | |
FR2120237A6 (fr) * | 1970-11-04 | 1972-08-18 | Dispositifs Elect Meca |
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NL73536C (fr) * | 1900-01-01 | |||
CA510889A (fr) * | 1955-03-15 | A. L. Girard Alexandre | Amortisseurs hydrauliques d'oscillations a action variable | |
US1584884A (en) * | 1922-08-12 | 1926-05-18 | Herbert L Merrick | Dashpot |
US1780531A (en) * | 1927-09-22 | 1930-11-04 | Messier George Louis Rene Jean | Pneumatic suspension for airplanes |
DE545334C (de) * | 1929-10-20 | 1932-02-29 | Ernst Wagner Appbau | Fluessigkeitsbremse, insbesondere fuer Karren mit hebbarer Plattform |
FR724772A (fr) * | 1931-10-19 | 1932-05-02 | Système d'amortisseur hydropneumatique | |
FR821516A (fr) * | 1937-05-07 | 1937-12-07 | Ver Deutsche Metallwerke Ag | Amortisseur de chocs, notamment pour atterrisseurs d'aéronef |
GB526807A (en) * | 1939-02-20 | 1940-09-26 | Noel Banner Newton | Improvements in or relating to suspension systems for vehicles |
US2224306A (en) * | 1939-11-02 | 1940-12-10 | Cleveland Pneumatic Tool Co | Shock absorbing device |
US2363485A (en) * | 1942-03-30 | 1944-11-28 | Automotive Prod Co Ltd | Telescopic shock absorber |
CH240566A (fr) * | 1942-04-24 | 1945-12-31 | Olaer Patent Co | Jambe télescopique d'atterrisseur pour avions. |
US2802664A (en) * | 1955-04-11 | 1957-08-13 | Gen Motors Corp | Hydro-pneumatic suspension unit |
US2959410A (en) * | 1958-10-27 | 1960-11-08 | Jarry Hydraulics | Double stage oleo-pneumatic shock absorber |
US3003595A (en) * | 1959-03-06 | 1961-10-10 | Gabriel Co | Shock absorbers |
DE6604159U (de) * | 1966-02-26 | 1969-12-11 | Hoesch Ag | Einrohr-teleskopschwingungsdaempfer, insbesondere fuer kraftfahrzeuge |
-
1977
- 1977-12-12 FR FR7737408A patent/FR2411341A1/fr active Granted
-
1978
- 1978-11-29 CA CA317,092A patent/CA1113971A/fr not_active Expired
- 1978-12-07 IT IT12895/78A patent/IT1104406B/it active
- 1978-12-08 GB GB7847809A patent/GB2011018B/en not_active Expired
- 1978-12-12 DE DE7836776U patent/DE7836776U1/de not_active Expired
- 1978-12-12 DE DE19782853589 patent/DE2853589A1/de active Granted
-
1981
- 1981-07-22 US US06/285,790 patent/US4405119A/en not_active Expired - Fee Related
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE920534C (de) * | 1942-08-26 | 1954-11-25 | Hemscheidt Maschf Hermann | Hydraulischer Schwingungsadaempfer, insbesondere fuer Kraftfahrzeuge |
FR948387A (fr) * | 1947-06-05 | 1949-07-29 | Siam | Perfectionnements aux amortisseurs à compression de liquide |
FR60568E (fr) * | 1950-01-13 | 1954-11-09 | Amortisseur hydraulique d'oscillation à résistance prédéterminée pour chaque amplitude d'oscillation | |
DE1184223B (de) * | 1960-04-01 | 1964-12-23 | Fichtel & Sachs Ag | Hydropneumatische Abfederung mit Daempfung und Niveauregelung, insbesondere fuer Kraftfahrzeuge |
LU39567A1 (fr) * | 1960-12-21 | 1961-04-21 | ||
FR1402818A (fr) * | 1963-04-13 | 1965-06-18 | Dispositifs d'asservissement, de régulation, d'arrêt, de commande de débits volumétriques ou de mouvements par l'emploi de cames hydrauliques et d'orifices calibrés | |
US3367453A (en) * | 1965-10-13 | 1968-02-06 | Pneumo Dynamics Corp | Bi-directional metering shock absorber |
US3451510A (en) * | 1968-01-22 | 1969-06-24 | Pneumo Dynamics Corp | Metering shock absorber with snubbing means and snub release means |
FR2079874A5 (fr) * | 1970-02-16 | 1971-11-12 | Federspiel Jean | |
FR2120237A6 (fr) * | 1970-11-04 | 1972-08-18 | Dispositifs Elect Meca |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2461852A1 (fr) * | 1979-07-17 | 1981-02-06 | Messier Hispano Sa | Perfectionnements aux amortisseurs et amortisseurs-verins notamment pour trains d'atterrissage d'aerodyne |
EP0129161A1 (fr) * | 1983-06-17 | 1984-12-27 | Hr Textron Inc. | Amortisseur pour train d'atterissage d'avion |
Also Published As
Publication number | Publication date |
---|---|
DE2853589A1 (de) | 1979-06-13 |
IT7812895A0 (it) | 1978-12-07 |
GB2011018B (en) | 1982-08-18 |
GB2011018A (en) | 1979-07-04 |
FR2411341B1 (fr) | 1983-01-14 |
CA1113971A (fr) | 1981-12-08 |
DE2853589C2 (fr) | 1987-01-08 |
DE7836776U1 (de) | 1979-04-26 |
US4405119A (en) | 1983-09-20 |
IT1104406B (it) | 1985-10-21 |
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