US PATENT SUBCLASS 219 / 61
.~.~.~ Methods

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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  DF  .~.~ Electric arc {3}
61.~.~.~ Methods

DEFINITION

Classification: 219/61

(under subclass 60) Methods.