Machines for processing metal, wood and plastic, agricultural machines, machines for installation work and construction machines; pneumatic and/or hydropneumatic cylinders and piston cylinders with or without locks as parts of machines, in particular for safety, anti-splash and sound-damping hoods, for machine casing and maintenance flaps, for fitting platforms and welding installations and for construction machines such as excavators, cranes, wheel bearings, rollers and compressors and for agricultural implements such as tractors, combine harvesters and field-working machines and for tractor seats and for construction machine seats; pneumatic and/or hydropneumatic cylinders and piston cylinders with or without locks as parts of machines, for pneumatic, hydraulic and hydropneumatic door closers, for roof domes, skylights, awnings, garage doors, attic stairs, tilting doors, waste containers for telephone boxes; pneumatic and/or hydropneumatic cylinders and piston cylinders with or without locks as parts of machines, for copying machines, computers, sound-absorbing hoods and for coin-operated automatic vending machines and juke boxes; pneumatic and/or hydropneumatic cylinders and piston cylinders with or without locks as parts of machines, for medical apparatus and instruments and for special beds and invalid chairs for medical care; pneumatic and/or hydropneumatic cylinders and piston cylinders with or without locks as parts of machines, for solaria, refrigerated counters and display cases, washing machines, tumble driers, dishwashers, microwave ovens, cookers, freezers, freezer cases, extractor hoods, cooking hob covers, waste containers and for tanning equipment; pneumatic and/or hydropneumatic cylinders and piston cylinders with or without locks as parts of machines, for vehicle seats, for tractor seats, for adjusting the axle springs of motor vehicles, for agricultural trailers, for body parts of motor vehicles such as motor vehicle doors, hoods, tailgates, boot lids, superstructures and glove compartment lids, for wheelchairs, for bicycles, for side windows, rear windows and front windows of motor vehicles, for wing doors, door stops, pop-up headlights, convertible tops of motor vehicles, roll bars and steering column adjustment of motor vehicles, for damping shift linkages and gas linkages, engine vibrations, drive belts and steering linkages; pneumatic and/or hydropneumatic cylinders and piston cylinders with or without locks as parts of machines, for furniture, in particular seating furniture and chairs, sick-beds, invalid chairs, folding beds, day beds, foldable couches, top-hung windows, cabinet doors and table tops and for small furniture such as serving tables, serving trolleys, occasional tables, for kitchen furniture, for office furniture such as drawing tables, computer desks, swivel arms, sound-absorbing hoods and for cases; pneumatic and/or hydropneumatic cylinders and piston cylinders with or without locks as parts of machines, for body-building equipment; coin-operated automatic vending machines and parts thereof (included in this class).;