US PATENT SUBCLASS 165 / DIG 206
.~.~ Including coiled heat exchange tube

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

DIG 184  DD  INDIRECT-CONTACT CONDENSER {12}
DIG 205  DD  .~ Space for condensable vapor surrounds space for coolant {4}
DIG 206.~.~ Including coiled heat exchange tube