US PATENT SUBCLASS 373 / 141
.~.~ Vacuum

Current as of: June, 1999
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373 /   HD   INDUSTRIAL ELECTRIC HEATING FURNACES

138  DF  INDUCTION FURNACE DEVICE {10}
140  DF  .~ With internal atmosphere control (e.g., pressure, vacuum, etc.) {1}
141.~.~ Vacuum

DEFINITION

Classification: 373/141

Vacuum:

(under subclass 140) Subject matter wherein the atmosphere is an enclosed space from which air, or other gases have been removed.