US PATENT SUBCLASS 126 / 117
.~ Preliminary air heater

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

99 R  DF  HOT-AIR FURNACES {24}
117.~ Preliminary air heater

DEFINITION

Classification: 126/117

(under subclass 99) Hot air furnaces having devices for heating the air before it is conveyed to the space formed by the surrounding jacket or casing of a furnace.

SEE OR SEARCH THIS CLASS, SUBCLASS:

114, for hot air furnace casings.