US PATENT SUBCLASS 219 / 130.33
.~.~.~.~ Responsive to both arc voltage and arc current

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
121.11  DF  .~ By arc {16}
130.1  DF  .~.~ Including arc-power supplies {5}
130.21  DF  .~.~.~ With automatic output control (e.g., shortcircuit, infrared) {3}
130.33.~.~.~.~ Responsive to both arc voltage and arc current

DEFINITION

Classification: 219/130.33

Responsive to both arc voltage and arc current:

(under subclass 130.21) Subject matter wherein the sensed condition pertains to arc voltage and arc current.