US PATENT SUBCLASS 418 / 20
.~.~ Three or more

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

16  DF  WITH CHANGEABLE WORKING CHAMBER MAGNITUDE {10}
19  DF  .~ Intermeshing rotary members {2}
20.~.~ Three or more

DEFINITION

Classification: 418/20

(under subclass 19) Apparatus having three or more rotating members at least one of which has a peripheral surface engaging the peripheral surfaces of two or more rotating members.