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El Paso, Texas, Phelps Dodge refining company. Electrolytic tanks in which sheets of pure copper are formed. The sheets are later melted and cast into ingots
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El Paso, Texas. Phelps Dodge refining company. Trimming bars of pure copper
El Paso, Texas. Phelps Dodge refinng company. Working at the electrolytic tanks in which sheets of pure copper are formed
El Paso, Texas. Phelps Dodge refinng company. Working at the electrolytic tanks in which sheets of pure copper are formed