US PATENT SUBCLASS 432 / 31
.~ Heating of or by wall or radiant surface

Current as of: June, 1999
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432 /   HD   HEATING

1  DF  PROCESSES OF HEATING OR HEATER OPERATION {14}
31.~ Heating of or by wall or radiant surface

DEFINITION

Classification: 432/31

(under subclass 1) Process for heating work by radiation or conduction or for heating a heating surface.