US PATENT SUBCLASS 237 / 55
.~ Flue heated

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

50  DF  AIR {4}
55.~ Flue heated

DEFINITION

Classification: 237/55

(under subclass 50) Air heating-systems ... in which the air is heated in a smoke flue.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

523+, for fireplace-type heater.