US PATENT SUBCLASS 165 / FOR 121
.~.~ Opposed compensating heating and cooling (165/30)

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

FOR 104  DF  AUTOMATIC CONTROL (165/13) {2}
FOR 105  DF  .~ Heating and cooling (165/14) {14}
FOR 121.~.~ Opposed compensating heating and cooling (165/30)

DEFINITION

Classification: 165/FOR.121

Foreign art collections in which a substance is subjected to simultaneous heating and cooling and in which either the heater or cooler is controlled by a condition sensor.