Ball valves being parts of machines; Hydraulic controls for machines, motors and engines; Hydraulic valve actuators; Hydraulic controls for machines, motors and engines; Pressure switches as parts of machines; Valves being parts of machines operated pneumatically and by air; Valves as machine components; Valves being parts of machines; Valves being parts of machines; Valves being parts of machines operated pneumatically and by air; Back pressure valves as parts of machines; Back pressure valv...