US PATENT SUBCLASS 165 / DIG 194
.~.~ First stage direct-contact condenser

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165 /   HD   HEAT EXCHANGE

DIG 184  DD  INDIRECT-CONTACT CONDENSER {12}
DIG 193  DD  .~ First-stage condenser serially connected to second-stage condenser {1}
DIG 194.~.~ First stage direct-contact condenser