US PATENT SUBCLASS 165 / DIG 123
.~ Heat exchange flow path through heat exchanger altered (e.g., crossed, etc.)

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 123.~ Heat exchange flow path through heat exchanger altered (e.g., crossed, etc.) {1}
DIG 124  DD  .~.~> Stove pipe drum {1}