US PATENT SUBCLASS 417 / 257
.~.~.~ Aligned

Current as of: June, 1999
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417 /   HD   PUMPS

244  DF  SUCCESSIVE STAGES {8}
254  DF  .~ Reciprocating rigid stages {8}
256  DF  .~.~ Stages comprise oppositely moving valved pumping members {1}
257.~.~.~ Aligned

DEFINITION

Classification: 417/257

(under subclass 256) Apparatus in which the axes of the oppositely moving pumping members form a common straight line.