US PATENT SUBCLASS 417 / 246
.~ Stages driven by relatively movable motor working members

Current as of: June, 1999
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417 /   HD   PUMPS

244  DF  SUCCESSIVE STAGES {8}
246.~ Stages driven by relatively movable motor working members {1}
247  DF  .~.~> Rotary

DEFINITION

Classification: 417/246

(under subclass 244) Apparatus in which the serial pumping units are provided with pumping members which are capable of or constrained to move relative to each other, said pumping members being driven by two or more working members which are capable of or constrained to move relative to each other.