US PATENT SUBCLASS 418 / 247
.~ In opposite directions

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

243  DF  POSITIVELY ACTUATED ABUTMENT {4}
247.~ In opposite directions

DEFINITION

Classification: 418/247

(under subclass 243) Apparatus in which the abutment is urged to move in each direction.