US PATENT SUBCLASS 418 / 89
.~ With filter for non-working fluid

Current as of: June, 1999
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418 /   HD   ROTARY EXPANSIBLE CHAMBER DEVICES

83  DF  HEAT EXCHANGE OR NON-WORKING FLUID LUBRICATING OR SEALING {13}
89.~ With filter for non-working fluid

DEFINITION

Classification: 418/89

(under subclass 83) Apparatus provided with porous means to remove physical impurities from the nonworking fluid.