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Individual
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Individual
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Mejoras en aparatos para la fabricación de pigmentos metálicos o compuestos y en la producción de pigmentos o compuestos de plomo y zinc y combinaciones de estos por los referidos aparatos.
Un procedimiento para la desulfuración por vía húmeda, de los minerales de níquel, cobre, zinc y otros y la hidroxidación de sus metales para extraerlos.