US PATENT SUBCLASS 126 / 109
.~ Tubular air heater
Current as of: June, 1999
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DEFINITION
Classification: 126/109
(under subclass 99) Hot air furnaces which have air-tubes passed vertically, horizontally, or diagonally through the combustion-chamber and which communicate with the space formed by the inclosing case or jacket.
SEE OR SEARCH THIS CLASS, SUBCLASS:
71, 72 and 106, for similar air heating arrangements.
SEE OR SEARCH CLASS
454, Ventilation, appropriate subclasses for building ventilation, per se.
