US PATENT SUBCLASS 165 / DIG 303
.~.~ Annular heat exchanger

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

DIG 228  DD  WITH FAN OR PUMP {3}
DIG 302  DD  .~ Rotary gas pump {7}
DIG 303.~.~ Annular heat exchanger {1}
DIG 304  DD  .~.~.~> Axial impeller {2}