US PATENT SUBCLASS 138 / 31
.~.~ Piston or plunger type

Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

26  DF  WITH PRESSURE COMPENSATORS {2}
30  DF  .~ Variable capacity chambers {1}
31.~.~ Piston or plunger type

DEFINITION

Classification: 138/31

(under subclass 30) Devices in which the chamber is of variable capacity by reason of a slidable piston or plunger.