US PATENT SUBCLASS 237 / 50
AIR

Current as of: June, 1999
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237 /   HD   HEATING SYSTEMS

50AIR {4}
52  DF  .~> Stove
53  DF  .~> Furnace
54  DF  .~> Upper-room drum
55  DF  .~> Flue heated

DEFINITION

Classification: 237/50

(under the class definition) Heating systems in which air is heated directly by a combustion apparatus and distributed.

SEE OR SEARCH CLASS

126, Stoves and Furnaces, for structure of heater.