US PATENT SUBCLASS 418 / 196
.~ Three or more

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

191  DF  INTERENGAGING ROTATING MEMBERS {9}
196.~ Three or more {1}
197  DF  .~.~> Helical or herringbone

DEFINITION

Classification: 418/196

(under subclass 191) Apparatus having three or more rotating members at least one of which has a peripheral surface engaging the peripheral surface of two or more other rotating members.