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Primary Smelting and Refining of Nonferrous Metals, Except Copper and Aluminum
Antifriction Bearing Metals, Lead-Base
Precious Metals Smelters and Refiners
Precious Praetorian Metals LLC
Primary Nonferrous Metals, Nec
Silicon Refining (Primary, Over 99% Pure)
Zinc Refining (Primary), Including Slabs & Dust