US PATENT SUBCLASS 236 / 17
.~ Pressure-operated

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

*  DD  EXCHANGE HEATERS {2}
17.~ Pressure-operated

DEFINITION

Classification: 236/17

(under the class definition) Devices controlling the supply of heating fluid to an exchange or surface heater by the pressure of the fluid heated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

14, for the same combined with furnace control.

26+, for pressure operated closed fluid heater control.

85, for the control, per se.