US PATENT SUBCLASS 266 / 198
.~.~.~ Having external support

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

168  DF  MEANS FOR TREATING ORES OR FOR EXTRACTING METALS {3}
171  DF  .~ By means applying heat to work, e.g., furnace {10}
197  DF  .~.~ Shaft-type furnace, e.g., blast furnace {2}
198.~.~.~ Having external support

DEFINITION

Classification: 266/198

(under subclass 197) Device having means external of the furnace for sustaining the furnace against the effects of gravity.