US PATENT SUBCLASS 219 / 137 R
.~.~.~ Process

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}
136  DF  .~.~ Welding {1}
137 R.~.~.~ Process {2}
137 PS  DF  .~.~.~.~> Power supply
137 WM  DF  .~.~.~.~> Weld metal composition

Unofficial Alpha Subclasses: R PS WM

DEFINITION

Classification: 219/137

(under subclass 136) Processes.