US PATENT SUBCLASS 219 / 124.03
.~.~.~ By arc voltage

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}
124.02  DF  .~.~ With gap control {1}
124.03.~.~.~ By arc voltage

DEFINITION

Classification: 219/124.03

By arc voltage:

(under subclass 124.02) Subject matter having sensor means

responsive to the voltage occurring in the gap between the arc torch and the work.