PARTS FOR USE IN MECHANICAL EQUIPMENT-NAMELY, SLEEVES, MEMBRANES, CYLINDER LINERS, BELLOWS, ELASTIC COUPLINGS, ELEXIBLE TORSION COUPLINGS, DIAPHRAGMS FOR USE IN SHOCK ABSORBERS, BUFFERS, VIBRATION DAMPERS, ENGINE MOUNTS, VALVE SEATS AND PUMP IMPELLERS; MACHINES FOR MAKING THE FOREGOING AS WELL AS FOR THE MANUFACTURE OF PISTON RINGS, GASKETS, OIL SEALS, PACKINGS, SHAFT SEALS AND SEALING RINGS AND FOR THE MANUFACTURE OF SEALING PARTS FOR ROTARY PISTON MACHINES AND FOR INTERNAL COMBUSTION ENGINE...