US PATENT SUBCLASS 72 / 342.7
.~ Of 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.~ Of tool {2}
342.8  DF  .~.~> Preheating
342.92  DF  .~.~> By electrical resistance heater within tool

DEFINITION

Classification: 72/342.7

Of tool:

(under subclass 342.1) Subject matter comprising means for or a step of localized heating or cooling of a tool* of a metal-deforming device.