A multiple stage pump having valves downstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations and shot to shot fuel variations.

 
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< Integrated electrostatic peristaltic pump method and apparatus

< Pump or motor with interconnected chambers in the rotor

> Diaphragm pump with overfill limiter

> Hydraulic control circuit for a hydraulic engine with at least two speeds
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