US PATENT SUBCLASS 417 / 555.2
.~.~ Well swabs

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
555.1  DF  .~ Fluid serially moved to opposite side of pumping member {2}
555.2.~.~ Well swabs

DEFINITION

Classification: 417/555.2

Well swabs:

(under subclass 555.1) Apparatus wherein the reciprocating pumping member is located in a well and used to force fluid from the pumping chamber.