US PATENT SUBCLASS 266 / 156
.~ By means recycling exhaust gas

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

144  DF  WITH MEANS TREATING OR HANDLING GASES EXHAUSTED BY TREATING MEANS {8}
156.~ By means recycling exhaust gas

DEFINITION

Classification: 266/156

(under subclass 144) Device wherein a portion of the evolved gas is returned to the metallurgical apparatus.