US PATENT SUBCLASS 432 / 57
.~ Heating gas supply, removal or recirculation correlated with work or door movement or placement

Current as of: June, 1999
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432 /   HD   HEATING

55  DF  WITH CONCURRENT CONTROL OR INTER-CONTROL OF DIVERSE OPERABLE ELEMENTS {2}
57.~ Heating gas supply, removal or recirculation correlated with work or door movement or placement

DEFINITION

Classification: 432/57

(under subclass 55) Apparatus in which the operation of a means supplying, removing or circulating a heating gas (e.g., combustion product etc.) is correlated with the operation of a means moving work within, inserting it into, or providing access to a heating zone.