12 [ Apparatus for locomotion by land, air or water, namely, tailgates/trunks, hoods, soft-tops and convertible tops, pick-up tailgates, seat adjustments, steering dampers, belt tensioning dampers, popup headlights, glove compartments, window adjustments, engine dampings, steering column adjustments, gullwing doors, seat height adjustments, backrest adjustments, foldout tables, backseat adjustments, roll bars, airplane interiors, namely, airplane seats, overhead luggage compartments, maintenance doors of airplane engines, boat hedges and cabin beds, and parts therefor, all the foregoing being parts of vehicles, aircrafts, and watercrafts; pneumatic, hydraulic and hydropneumatic cylinders, pistons for cylinders, pistons, piston cylinders, piston rods, vibration dampers, shock absorbers, shock absorbing pistons, shock absorbing springs, ] gas springs with or without locking mechanisms being structural parts for driving the movement and/or for damping the movement of vehicles for locomotion by land, air, water and rail, agricultural trailers, motor vehicle bodywork parts, including motor vehicle doors, hoods, covers, boot covers, superstructures, hoods for vehicle engines, tailgates, tailboards for pickup vehicles and glove compartment lids, side windows, rear windscreens and windscreens for motor vehicles, folding doors, door stops, hidden headlamps, convertible tops for motor vehicles, components for storage compartments in caravans, roll bars and steering column adjusters for motor vehicles, for adjusting motor vehicle axle springs, for driving the movement and/or for damping the movement of movable parts of agricultural trailers, wheelchairs, bicycles, scooters, for damping gear linkages and throttle linkages, engine vibrations, V-belts and steering linkages, retractable covers for lorries, tipping superstructures for lorries, tilting-carts