Feed pumps, namely gas or fluid pumps for use in machines or tools; aerating pumps for aerating liquids; air and gas compressors; compressing machines; circulating pumps; non-return flaps of metal in the nature of valves being parts of machines; non-return valves of metal being parts of machines; non-metallic check valves being parts of machines; hydraulic pumps; hydraulic engines and motors; hydraulic valve actuators; hydraulic valves being parts of machines; pneumatic actuating apparatus fo...