Internal combustion engines (except engines for automobiles, tractors, grain combines, motorcycles and steam locomotives); diesel engines; diesel generating sets; natural gas engines; natural gas generating sets; coal gas engines; gasoline engines; marine engines; engines; generators (sets); compressors (machines); gas engines (other than for land vehicles); pumps (parts of machines engines or motors); crank shafts; connecting rods for machines, motors and engines; cylinder heads for engines; cylinders for motors and engines; bearings (parts of machines)