Oil well pumping apparatus and method
Oil well pumping mechanism
Omnidirectional oscillator (glover gear)
Orbiting mass oscillator with oil film cushioned bearings
Oscillating member for transforming a rotary motion into a recip
Oscillation generating apparatus
Oscillation lever arm engine
Oscillatory motion speed converter having drive and driven cams
Pedal system
Pendulum gear, especially for windshield wipers of motor vehicle
Pick-up and placement apparatus
Piston drive assembly
Piston power generating and working machine
Piston power generating machine
Piston stroke varying mechanism for expansible chamber energy co
Piston supporting structure for stirling cycle machine
Piston-operated machine
Pivot joint with retainer clip
Portable walking beam pump jack
Portable walking beam pump jack