US PATENT SUBCLASS 165 / DIG 51
HAVING EXPANSION AND CONTRACTION RELIEVING OR ABSORBING MEANS

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

DIG 51HAVING EXPANSION AND CONTRACTION RELIEVING OR ABSORBING MEANS {2}
DIG 52  DD  .~> For cylindrical heat exchanger {6}
DIG 71  DD  .~> Resilient fluid seal for plate-type heat exchanger