US PATENT SUBCLASS 266 / 199
.~.~.~ Having specific top structure

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}
199.~.~.~ Having specific top structure

DEFINITION

Classification: 266/199

(under subclass 197) Device wherein the upper region of the furnace has a particular configuration or includes additional structural members which facilitate the operation of the furnace.