US PATENT SUBCLASS 418 / 47
.~ With filter

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

46  DF  WITH REMOVAL OR ACCOMMODATION OF SOLID FOREIGN MATERIAL IN WORKING FLUID {1}
47.~ With filter

DEFINITION

Classification: 418/47

(under subclass 46) Apparatus wherein there is provided a screen device to strain incoming working fluid.