US PATENT SUBCLASS 373 / 66
.~.~ Combined with or convertible to direct arc furnace

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

60  DF  ARC FURNACE DEVICE {9}
61  DF  .~ Indirect {3}
66.~.~ Combined with or convertible to direct arc furnace

DEFINITION

Classification: 373/66

Combined with or convertible to direct arc furnace:

(under subclass 61) Subject matter including both direct and indirect arc heating, or which may be changed from one to the other.