US PATENT SUBCLASS 373 / 119
.~.~ Wall contained
Current as of:
June, 1999
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373 /
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INDUSTRIAL ELECTRIC HEATING FURNACES
109
DF
RESISTANCE FURNACE DEVICE
{7}
117
DF
.~ With heating element detail {7}
119
.~.~ Wall contained
DEFINITION
Classification: 373/119
Wall contained:
(under subclass 117) Subject matter wherein the heating element is located within the wall of the furnace.