US PATENT SUBCLASS 165 / DIG 193
.~ First-stage condenser serially connected to second-stage condenser

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

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