US PATENT SUBCLASS 126 / 537
.~.~ Screw operator

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

500  DF  FIREPLACES OR ACCESSORIES {19}
536  DF  .~ Adjustable flue damper {3}
537.~.~ Screw operator

DEFINITION

Classification: 126/537

Screw operator:

(under subclass 536) Subject matter wherein said means for moving said closure plate comprises interengaging helical threads relatively rotatable by an inhabitant in said closure.