US PATENT SUBCLASS 219 / 61.1
.~.~ Having internal support means

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}
61.1.~.~ Having internal support means {3}
61.11  DF  .~.~.~> With forming means
61.12  DF  .~.~.~> With cleaning means
61.13  DF  .~.~.~> With edge guidance means

DEFINITION

Classification: 219/61.1

Having internal support means:

(under subclass 59.1) Subject matter including support means for the cylinder, positioned inside the cylinder during the welding process.