US PATENT SUBCLASS 236 / 61
.~.~.~ With pressure control

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

*  DD  AIR-RELIEF VALVES {1}
*  DD  .~ Radiator type {1}
*  DD  .~.~ Thermostatic {5}
61.~.~.~ With pressure control

DEFINITION

Classification: 236/61

(under the class definition) Air relief-valves controlled by both thermostatic and pressure-controlled means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

92, for controls with pressure and temperature responsive means.