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Procédé pour la fabrication de petites pièces pouvant etre expédiées et manipulées, en ferro-silicium ou d'autres matières premières, à employer dans la production d'alliages de fer
Procédé pour la production d'acide fluorhydrique en partant des fluorures naturels particulièrement de la fluorite et de l'acide sulfurique, de facon ininterrompue