US PATENT SUBCLASS 266 / 211
.~.~.~ Enclosed within casing

Current as of: June, 1999
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266 /   HD   METALLURGICAL APPARATUS

200  DF  MEANS FOR MELTING OR VAPORIZING METAL OR TREATING LIQUEFIED METAL {19}
207  DF  .~ By providing, treating or protecting environment, e.g., vacuum {1}
208  DF  .~.~ By application of vacuum {2}
211.~.~.~ Enclosed within casing

DEFINITION

Classification: 266/211

(under subclass 208) Device wherein a molten- metal containing or receiving vessel is contained within and surrounded by a housing which housing is communicable with a source of vacuum.