US PATENT SUBCLASS 165 / DIG 115
.~.~.~.~ Surrounding by a helical flow channel


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

DIG 92  DD  WITH VALVE OR MOVABLE DEFLECTOR FOR HEAT EXCHANGE FLUID FLOW {6}
DIG 109  DD  .~ With by-pass of heat exchanger or heat exchanger section {2}
DIG 110  DD  .~.~ Bypass within or surrounds heat exchanger {4}
DIG 113  DD  .~.~.~ Bypass centrally located in heat exchanger {3}
DIG 115.~.~.~.~ Surrounding by a helical flow channel