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Individual
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Un procedimiento para reducir y fundir minerales en estufas u hornos de fundir eléctricos con galería superpuesta, recorrida por los gases calientes escapados de la citada estufa u horno de fundir.
Un material refractario básico, con el procedimiento correspondiente para su fabricación, para el revestimiento de hornos eléctricos, o en general, de hornos para metalurgia.