BUFFERS AND ELASTIC COUPLINGS FOR USE IN MACHINES AND MACHINE-MOUNTS TO ELIMINATE VIBRATIONS; ENGINE MOUNTS; VALVE SEATS; CYLINER LINERS; TURNING MACHINES, GRINDERS, SANDBLASTERS, FOUNDRY MOLDING MACHINES; AND SURFACE TREATING MACHINES FOR THE MANUFACTURE OF PISTON RINGS, OIL SEALS, GASKETS, SEALING PARTS, DIAPHRAGMS FOR USE IN SHOCK ABSORBERS AND SUSPENSION UNITS, BUFFERS, ELASTIC COUPLING, ENGINE MOUNTS, VALVE SEATS AND CYLINDER LINERS