US PATENT SUBCLASS 418 / 59
.~.~ Radially spaced working chambers

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

54  DF  WORKING MEMBER HAS PLANETARY OR PLANETATING MOVEMENT {6}
58  DF  .~ Plural working members or chambers {3}
59.~.~ Radially spaced working chambers

DEFINITION

Classification: 418/59

(under subclass 58) Apparatus in which at least one working chamber surrounds another.