IT1221037B - IMPROVEMENT IN DRIVE POWER TRANSMISSIONS IN PARTICULAR FOR HYDRAULIC DRIVE COMPLEXES FOR EARTH-MOVING MACHINES - Google Patents
IMPROVEMENT IN DRIVE POWER TRANSMISSIONS IN PARTICULAR FOR HYDRAULIC DRIVE COMPLEXES FOR EARTH-MOVING MACHINESInfo
- Publication number
- IT1221037B IT1221037B IT48246/80A IT4824680A IT1221037B IT 1221037 B IT1221037 B IT 1221037B IT 48246/80 A IT48246/80 A IT 48246/80A IT 4824680 A IT4824680 A IT 4824680A IT 1221037 B IT1221037 B IT 1221037B
- Authority
- IT
- Italy
- Prior art keywords
- complexes
- earth
- improvement
- drive
- power transmissions
- Prior art date
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
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
- F16H61/433—Pump capacity control by fluid pressure control means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
- F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/35—Directional control combined with flow control
- F15B2211/351—Flow control by regulating means in feed line, i.e. meter-in control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/46—Control of flow in the return line, i.e. meter-out control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5156—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a return line and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/555—Pressure control for assuring a minimum pressure, e.g. by using a back pressure valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/605—Load sensing circuits
- F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
- F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/61—Secondary circuits
- F15B2211/613—Feeding circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
- F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/75—Control of speed of the output member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Valve Device For Special Equipments (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/024,058 US4201052A (en) | 1979-03-26 | 1979-03-26 | Power transmission |
US11793680A | 1980-02-04 | 1980-02-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
IT8048246A0 IT8048246A0 (en) | 1980-03-24 |
IT1221037B true IT1221037B (en) | 1990-06-21 |
Family
ID=26697984
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT48246/80A IT1221037B (en) | 1979-03-26 | 1980-03-24 | IMPROVEMENT IN DRIVE POWER TRANSMISSIONS IN PARTICULAR FOR HYDRAULIC DRIVE COMPLEXES FOR EARTH-MOVING MACHINES |
IT8948200A IT1232358B (en) | 1979-03-26 | 1989-07-18 | ARRANGEMENT IN A HYDRAULIC CIRCUIT INCLUDING A PRESSURIZED FLUID SOURCE AND AT LEAST A HYDRAULIC MOTOR |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT8948200A IT1232358B (en) | 1979-03-26 | 1989-07-18 | ARRANGEMENT IN A HYDRAULIC CIRCUIT INCLUDING A PRESSURIZED FLUID SOURCE AND AT LEAST A HYDRAULIC MOTOR |
Country Status (10)
Country | Link |
---|---|
JP (1) | JPS6479405A (en) |
AU (1) | AU536970B2 (en) |
CA (1) | CA1142057A (en) |
DE (1) | DE3011088A1 (en) |
FR (1) | FR2452618A1 (en) |
GB (1) | GB2044366B (en) |
IN (1) | IN154913B (en) |
IT (2) | IT1221037B (en) |
NO (1) | NO155211C (en) |
SE (2) | SE443409B (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4345435A (en) * | 1980-05-05 | 1982-08-24 | Sperry Corporation | Power transmission |
US4353289A (en) * | 1980-05-29 | 1982-10-12 | Sperry Corporation | Power transmission |
FI72579C (en) * | 1981-11-12 | 1987-06-08 | Vickers Inc | Transmission. |
DE3347000A1 (en) * | 1983-12-24 | 1985-07-04 | Robert Bosch Gmbh, 7000 Stuttgart | Electrohydraulic arrangement for controlling a double-acting hydraulic motor |
CA1234529A (en) * | 1984-04-30 | 1988-03-29 | Vinod K. Nanda | Power transmission |
LU85774A1 (en) * | 1985-02-13 | 1985-07-24 | Hydrolux Sarl | STEUERBLOCK HYDRAULISCHER |
DE3629479A1 (en) * | 1985-09-03 | 1987-07-16 | Barmag Barmer Maschf | Directional control valve |
DE3841507C1 (en) * | 1988-01-22 | 1989-06-29 | Danfoss A/S, Nordborg, Dk | |
US5088384A (en) * | 1989-08-30 | 1992-02-18 | Vickers, Incorporated | Hydraulic actuator controlled by meter-in valves and variable pressure relief valves |
DE4342487B4 (en) * | 1993-12-13 | 2005-03-31 | Linde Ag | Hydrostatic drive system with after-suction valve |
DE10216958B8 (en) * | 2002-04-17 | 2004-07-08 | Sauer-Danfoss (Nordborg) A/S | Hydraulic control |
US20060168955A1 (en) * | 2005-02-03 | 2006-08-03 | Schlumberger Technology Corporation | Apparatus for hydraulically energizing down hole mechanical systems |
EP3064654A4 (en) * | 2013-10-31 | 2017-06-28 | Volvo Construction Equipment AB | Flow control valve for construction equipment, having floating function |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE26028E (en) * | 1963-05-16 | 1966-05-17 | Pilot operated control valve mechanism | |
US3411536A (en) * | 1966-07-06 | 1968-11-19 | Koehring Co | Pilot operated control valve mechanism |
GB1302741A (en) * | 1969-04-07 | 1973-01-10 | ||
DE1936370A1 (en) * | 1969-07-17 | 1971-02-04 | Volkswagenwerk Ag | Valve unit for controlling double-acting working cylinders |
DE2232857C2 (en) * | 1972-07-05 | 1983-11-24 | Robert Bosch Gmbh, 7000 Stuttgart | Control device for a hydraulically driven implement |
CH563532A5 (en) * | 1973-03-14 | 1975-06-30 | Buehler Ag Geb | |
SE387415B (en) * | 1974-03-22 | 1976-09-06 | Tedeco Ag | FLUID VALVE DEVICE |
DE2500096C3 (en) * | 1975-01-03 | 1984-08-02 | Sauer Getriebe KG, 2350 Neumünster | Hydraulic circuit device for pressure medium path control with constant control of the pressure medium flow for a double-acting hydraulic motor |
US3991571A (en) * | 1976-03-15 | 1976-11-16 | Caterpillar Tractor Co. | Fluid system of a work vehicle having fluid combining means and signal combining means |
JPS5482574A (en) * | 1977-12-13 | 1979-06-30 | Kobe Steel Ltd | Control circuit of actuator |
-
1980
- 1980-03-22 DE DE19803011088 patent/DE3011088A1/en not_active Withdrawn
- 1980-03-24 IT IT48246/80A patent/IT1221037B/en active
- 1980-03-25 AU AU56824/80A patent/AU536970B2/en not_active Ceased
- 1980-03-25 GB GB8009963A patent/GB2044366B/en not_active Expired
- 1980-03-25 NO NO800846A patent/NO155211C/en unknown
- 1980-03-25 CA CA000348366A patent/CA1142057A/en not_active Expired
- 1980-03-25 FR FR8006633A patent/FR2452618A1/en active Granted
- 1980-03-25 SE SE8002302A patent/SE443409B/en not_active IP Right Cessation
- 1980-09-02 IN IN1004/CAL/80A patent/IN154913B/en unknown
-
1985
- 1985-07-23 SE SE8503569A patent/SE455637B/en not_active IP Right Cessation
-
1988
- 1988-09-06 JP JP63223358A patent/JPS6479405A/en active Pending
-
1989
- 1989-07-18 IT IT8948200A patent/IT1232358B/en active
Also Published As
Publication number | Publication date |
---|---|
AU536970B2 (en) | 1984-05-31 |
NO155211B (en) | 1986-11-17 |
IN154913B (en) | 1984-12-22 |
JPS6479405A (en) | 1989-03-24 |
FR2452618A1 (en) | 1980-10-24 |
NO155211C (en) | 1987-02-25 |
SE8503569L (en) | 1985-07-23 |
IT8048246A0 (en) | 1980-03-24 |
SE455637B (en) | 1988-07-25 |
GB2044366A (en) | 1980-10-15 |
DE3011088A1 (en) | 1980-10-09 |
SE443409B (en) | 1986-02-24 |
FR2452618B1 (en) | 1984-02-24 |
SE8002302L (en) | 1980-09-27 |
IT8948200A0 (en) | 1989-07-18 |
NO800846L (en) | 1980-09-29 |
IT1232358B (en) | 1992-01-28 |
SE8503569D0 (en) | 1985-07-23 |
GB2044366B (en) | 1983-08-03 |
AU5682480A (en) | 1980-10-02 |
CA1142057A (en) | 1983-03-01 |
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