US PATENT SUBCLASS 219 / 60 R
.~.~ Electric arc

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}
60 R.~.~ Electric arc {3}
60.2  DF  .~.~.~> Tube sheet welding
61  DF  .~.~.~> Methods
60 A  DF  .~.~.~> Rotatable tube welders

Unofficial Alpha Subclasses: R A

DEFINITION

Classification: 219/60

(under subclass 59.1) Subject matter in which the bonding is accomplished by an electric arc.