Mechanical, [ pneumatic or hydraulic ] control elements and controls for valves; [ hydraulic, pneumatic and ] linear actuators; actuators for valves being machine parts; control mechanisms for machines, engines and motors, namely, drives of metal or plastic operated manually or externally controlled; [ pneumatic or hydraulic operated switches, valve diaphragms for actuating industrial plants being parts of machines; valves, clack valves, diaphragms and taps of plastic and/or metal as machine ...