[ Motors and engines except for land vehicles; machine coupling and transmission components except for land vehicles; ] parts for machines or engines of carbon, graphite, carbon materials, impregnated carbon materials, carbon graphite materials, carbon composite materials, silicon carbide and graphite composite materials, silicon carbide and ceramics, in particular [ sliding inserts, bearings, pistons, and ] gaskets in the nature of gasket sealings, sealing rings; [ pistons for engines, pisto...