Pumps as parts of machines, motors and engines; single pump parts, namely, impellers, casings, housings, shaft bearings, seals for industrial pump applications; slide bearings as machine parts; machine wheels in the nature of machine parts; pistons as machine parts, namely, pistons for engines; piston sleeves in the nature of machine parts, namely, piston rings; friction bodies in the nature of machine parts, namely, anti-friction bearings for machines, anti-friction liners as wear protection...