37 Remanufacture of used machines, parts of machines, and parts for motor vehicles; remanufacture of motors, engines, transmissions and components thereof, namely, cylinder heads, crankshafts, manifolds, pushrods, camshafts, connecting rods, crankcases, engine bearings, pumps for motors and engines, water pumps, and oil pumps; all the aforesaid services to the order and/or specification of others