US PATENT SUBCLASS 418 / 231
.~.~.~ In opposite directions

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

228  DF  AXIALLY MOVING VANE OR ABUTMENT {2}
229  DF  .~ Sliding {1}
230  DF  .~.~ Positively biased {1}
231.~.~.~ In opposite directions {1}
232  DF  .~.~.~.~> Spring or fluid bias

DEFINITION

Classification: 418/231

(under subclass 230) Apparatus in which the vane or abutment is positively moved in both directions.