US PATENT SUBCLASS 219 / 78.13
.~.~ With additional heating device

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

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
78.01  DF  .~ For bonding with pressure (e.g., resistance welding) {16}
78.13.~.~ With additional heating device

DEFINITION

Classification: 219/78.13

With additional heating device:

(under subclass 78.01) Subject matter including means for heating part or all of the work being welded other than the heating means used principally for accomplishing the welding process.

SEE OR SEARCH THIS CLASS, SUBCLASS:

91.22, for methods of additional heating to the same spot.