US PATENT SUBCLASS 432 / 251
.~ Having expansion relieving or absorbing means

Current as of: June, 1999
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432 /   HD   HEATING

247  DF  HEATING OR HEAT RETAINING WORK CHAMBER STRUCTURE {5}
251.~ Having expansion relieving or absorbing means

DEFINITION

Classification: 432/251

(under subclass 247) Apparatus having structure preventing or limiting damage to the apparatus by relieving or absorbing heat induced expansive forces.