Counterbalance wheel for a wind machine
Energy collection and storage system
Linear fluid handling, rotary drive, mechanism
Loop pump
Pressure storage structure for use in air
Pressure storage structure for use in air
Push-pull windmill head having double beam pumping jack
Reciprocating windmill pumping system
Reversible hydraulic engine
River pump device
Transducer for conversion of tidal current energy
Water action powered pump
Wind driven air pump
Wind driven high pressure water pump
Wind energy conversion system
Wind powered apparatus
Wind-energy conversion device
Windmill having counterbalancing mechanism
Windmill pump drive system
Windmill structures and systems