US PATENT SUBCLASS 236 / 104
.~.~ Fire pot

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

*  DD  THERMOSTATIC {9}
101 R  DF  .~ Expanding solid {8}
104.~.~ Fire pot

DEFINITION

Classification: 236/104

(under subclass 101) Devices in which the expansion and contraction of a fire-pot, or a combustion-chamber wall of a heater is used to regulate the heating effect thereof.