US PATENT SUBCLASS 236 / 27
.~.~ With balancing pressure chamber

Current as of: June, 1999
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236 /   HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

20 R  DF  CLOSED FLUID HEATERS {8}
26 R  DF  .~ Pressure-operated {11}
27.~.~ With balancing pressure chamber

DEFINITION

Classification: 236/27

(under subclass 26) Devices where the effect of the heater-pressure is counterbalanced by a closed pressure-chamber.