US PATENT SUBCLASS 165 / DIG 513
.~.~ Corrosion resistant

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 512  DD  .~ Coated heat transfer surface {2}
DIG 513.~.~ Corrosion resistant