US PATENT SUBCLASS 72 / 342.92
.~.~ By electrical resistance heater within tool

Current as of: June, 1999
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72 /   HD   METAL DEFORMING

342.1  DF  WITH TEMPERATURE MODIFICATION OF TOOL OR OF SPECIFIED PORTION OF WORK {3}
342.7  DF  .~ Of tool {2}
342.92.~.~ By electrical resistance heater within tool

DEFINITION

Classification: 72/342.92

By electrical resistance heater within tool:

(under subclass 342.7) Subject matter wherein the tool is heated by a device intended for that purpose which device utilize its resistance to the flow of electrical current to raise the thermal level of the tool.