US PATENT SUBCLASS 219 / 62
.~.~ Helical seam

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}
62.~.~ Helical seam

DEFINITION

Classification: 219/62

(under subclass 59.1) Subject matter in which the longitudinal bond or seam is helical.