Flight control system
Fluid pressure driven reciprocating engine
Helicopter swashplate controller
Hydraulic control system for two operating cylinders
Hydraulic system for use in engines having reciprocating pistons
Method and apparatus for the production of mechanical power...
Oscillatory electro-hydraulic system
Pivotal positioning servoactuator
Plunger pump
Pneumatic engine
Pneumatically driven devices
Pressurized gas engine
Reciprocating engine with improved feed and exhaust valve means
Reciprocating engine with improved main bearing
Reciprocating engine with improved piston movement stabilizing m
Reciprocating engine with improved power output linkage
Reciprocating engine with improved power output means
Sequentially operated cylinders with load holding valve integrat
Servo-control valve for a linear hydraulic motor
Vibration-free hydraulic power system