US PATENT SUBCLASS 165 / DIG 530
.~.~ Conduit insert

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

DIG 510  DD  HAVING HEAT EXCHANGE SURFACE TREATMENT, ADJUNCT OR ENHANCEMENT {7}
DIG 529  DD  .~ With structure for promoting turbulence and/or breaking up laminar flow adjacent heat transfer surface {1}
DIG 530.~.~ Conduit insert