US PATENT SUBCLASS 236 / *
.~ Flue or heater attached

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

*  DD  THERMOSTATIC {9}
*.~ Flue or heater attached {2}
95  DF  .~.~> Expanding fluid
96  DF  .~.~> Expanding solid