US PATENT SUBCLASS 373 / 73
.~.~ Roof

Current as of: June, 1999
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373 /   HD   INDUSTRIAL ELECTRIC HEATING FURNACES

60  DF  ARC FURNACE DEVICE {9}
71  DF  .~ Furnace body detail {4}
73.~.~ Roof {1}
74  DF  .~.~.~> With cooling

DEFINITION

Classification: 373/73

Roof:

(under subclass 71) Subject matter including a cover, or lid for the furnace.