US PATENT SUBCLASS 165 / DIG 134
.~.~ By varying thickness of conductive layer (e.g., air gap, etc.)

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165 /   HD   HEAT EXCHANGE

DIG 132  DD  WITH ADJUSTOR FOR HEAT FLOW {1}
DIG 133  DD  .~ Conduction rate {1}
DIG 134.~.~ By varying thickness of conductive layer (e.g., air gap, etc.)