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| Keywords: Lead blast furnace x-section.gif en Cross-section of a blast furnace used for smelting lead fr Vue en coupe d'un haut fourneau utilisé pour la fusion du plomb http //www osha gov/SLTC/etools/leadsmelter/smelting/blastfurnace html U S Department of Labor - Occupational Safety Health Administration PD-USGov Lead blast furnaces Lead smelting | ||||
