US PATENT SUBCLASS 417 / 487
.~.~ Coaxial reciprocating pumping members

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
486  DF  .~ Plural pumping members in single pump chamber {1}
487.~.~ Coaxial reciprocating pumping members {1}
488  DF  .~.~.~> Form opposite chamber walls

DEFINITION

Classification: 417/487

(under subclass 486) Apparatus having at least two pumping members within said single chamber which are adapted for

to-and-fro movement upon a common longitudinal axis.