US PATENT SUBCLASS 110 / 158
.~.~.~ Door operated

Current as of: June, 1999
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110 /   HD   FURNACES

147  DF  DRAFT REGULATORS {5}
150  DF  .~ Steam injector {1}
157  DF  .~.~ Feeding air {1}
158.~.~.~ Door operated

DEFINITION

Classification: 110/158

(under subclass 157) Devices having an air-opening valve controlled by movement of a furnace door.

SEE OR SEARCH THIS CLASS, SUBCLASS:

174, for doors having means for feeding air or steam.

192, for time controls.