US PATENT SUBCLASS 110 / 120
.~ Furnace conductor

Current as of: June, 1999
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110 /   HD   FURNACES

119  DF  SPARK ARRESTERS {3}
120.~ Furnace conductor

DEFINITION

Classification: 110/120

(under subclass 119) Devices in which the sparks are returned to the furnace, either to the firebox or ashpan.

SEE OR SEARCH THIS CLASS, SUBCLASS:

203+, for structure in which smoke and sparks both are returned to the firebox.