US PATENT SUBCLASS 126 / 293
.~.~ Combined damper and ventilator

Current as of: June, 1999
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126 /   HD   STOVES AND FURNACES

285 R  DF  DAMPERS {7}
292  DF  .~ Stovepipe {5}
293.~.~ Combined damper and ventilator

DEFINITION

Classification: 126/293

(under subclass 292) Damper devices where the smoke-controlling damper and the ventilating-damper are so connected that the movement of one operates to move the other.