US PATENT SUBCLASS 73 / 863.84
.~.~.~ Expansible chamber

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

863  DF  SAMPLER, SAMPLE HANDLING, ETC. {11}
863.81  DF  .~ Withdrawing through conduit or receptacle wall {4}
863.83  DF  .~.~ With metering means or pump {1}
863.84.~.~.~ Expansible chamber

DEFINITION

Classification: 73/863.84

Expansible chamber:

(under subclass 863.83) Subject matter wherein the positive displacement means is a compartment including means to change its volume.