Operating valve device
Optical control system
Optically controlled transducer
Orbiting motor gear drive
Oscilatory hydraulic actuators with internal supply, return, and
Oscillating engine
Oscillating piston controlled by piloted valve, piston position
Oscillating steam engines
Oscillator
Oscillator actuated hydraulic impulse device
Oscillator reciprocation control system for piston motor
Oscillatory electro-hydraulic system
Output push rod and spring retainer
Overload release system for an axially movable bolt
Overload relief valve
Overruning load control for hydraulic jacks
Overrunning load control for hydraulic motors