US PATENT SUBCLASS 418 / 194
.~ Each tapered

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

191  DF  INTERENGAGING ROTATING MEMBERS {9}
194.~ Each tapered

DEFINITION

Classification: 418/194

(under subclass 101) Apparatus in which each of the coacting rotating members comprises an elongate circumferential surface complementary to the other and progressively enlarged or reduced from end to end thereof.