US PATENT SUBCLASS 418 / 6
.~ One working chamber stage encircles another

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

5  DF  MULTISTAGE {7}
6.~ One working chamber stage encircles another

DEFINITION

Classification: 418/6

(under subclass 5) Apparatus wherein a working chamber surrounds another working chamber with which it is in working fluid series flow relationship.