US PATENT SUBCLASS 266 / 250
.~ Having evacuated chamber

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

249  DF  MEANS TREATING SOLID METAL {5}
250.~ Having evacuated chamber

DEFINITION

Classification: 266/250

(under subclass 249) Device wherein the work is placed in a receptacle having means to change the temperature thereof said receptacle further having means to create a treating

environment by lowering the gas pressure therein.