US PATENT SUBCLASS 219 / 121.23
.~.~.~.~ Monitoring

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

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
121.11  DF  .~ By arc {16}
121.12  DF  .~.~ Using electron beam {12}
121.21  DF  .~.~.~ Chamber {2}
121.23.~.~.~.~ Monitoring

DEFINITION

Classification: 219/121.23

Monitoring:

(under subclass 121.21) Subject matter wherein means are provided for visual or electronic communication with the interior of the chamber.

(1) Note. Communication includes such things as microscope and T.V. view.