US PATENT SUBCLASS 266 / 251
.~ By contact with gas

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

249  DF  MEANS TREATING SOLID METAL {5}
251.~ By contact with gas {2}
252  DF  .~.~> With heating means {4}
258  DF  .~.~> By contacting only selected areas of object

DEFINITION

Classification: 266/251

(under subclass 249) Device wherein the treating operation involves a) surrounding the metallic article with a specific gaseous atmosphere or b) applying or directing a specific treating gas against the metallic article.