US PATENT SUBCLASS 266 / 258
.~.~ By contacting only selected areas of object

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

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

DEFINITION

Classification: 266/258

(under subclass 251) Device wherein the apparatus is so arranged or additional means are provided to insure that the gas contact with the object to be treated will be restricted to only a certain pre-established section of said object.