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ES36991A1905-10-201905-10-20Un procedimiento para hacer inofensivos y aprovechar los gases venenosos en la calcinación de mineral.
ExpiredES36991A3
(es)
Un procedimiento para el aprovechamiento de escorias y minerales que contienen metales pesados con el objeto de utilizar dichos metales y el azufre de las matas producidas con el procedimiento.