US PATENT SUBCLASS 165 / DIG 536
.~ Noncircular cross-section

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

DIG 532  DD  HEAT EXCHANGE CONDUIT STRUCTURE {4}
DIG 536.~ Noncircular cross-section {1}
DIG 537  DD  .~.~> Oblong or elliptical