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ES95101A1925-09-111925-09-11Un procedimiento para la fabricación directa de aleaciones de hierro y de acero a partir de minerales oxidados.
ExpiredES95101A1
(es)
Un procedimiento para la fabricación directa a partir de minerales de hierro y de materias análogas, de hierro o de metales por el estilo, con determinada proporción de carbono.