US PATENT SUBCLASS 219 / 61.6
.~.~ Using three or more electrodes

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

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
59.1  DF  .~ Of cylinders (e.g., pipes and tubes) {14}
61.6.~.~ Using three or more electrodes

DEFINITION

Classification: 219/61.6

Using three or more electrodes:

(under subclass 59.1) Subject matter including the use of three or more electrodes in the welding process.