US PATENT SUBCLASS 418 / 248
.~ Spring biased

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

243  DF  POSITIVELY ACTUATED ABUTMENT {4}
248.~ Spring biased

DEFINITION

Classification: 418/248

(under subclass 243) Apparatus in which the abutment is urged into engagement with the working member by a resilient mechanical means.