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ES56017A1913-07-121913-07-12Un procedimiento para tratar minerales aplicable más especialmente parar tostar piritas agotadas o quemadas y semejantes.
ExpiredES56017A1
(es)
Un procedimiento perfeccionado para el tratamiento del cloruro de plomo, o plomo básico, aplicable a la recuperación del plomo de sus minerales, residuos y escombreras.