73302642
Mar 25, 1981
Feb 16, 1982
Valves for Machines-Namely, Turbine, Throttle and Trip Valves; Intercept and Stop Valves; Relief Valves, Check Valves, Toggle and Manifold Valves; and Steam Strainers
MachineryValves Operated Automatically by Electric Current Control, by Solenoid or by Other Changes in Physical Conditions
Electrical and Scientific Apparatus