US PATENT SUBCLASS 126 / 524
.~.~ Tubular

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

500  DF  FIREPLACES OR ACCESSORIES {19}
523  DF  .~ With heat exchanger for room heating air {7}
524.~.~ Tubular {2}
525  DF  .~.~.~> Secondary outlet leads air to flame
526  DF  .~.~.~> With air flow regulator

DEFINITION

Classification: 126/524

Tubular:

(under subclass 523) Subject matter wherein said heated surface is generally circular or square in cross-section.