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Operator prepares to charge light aluminum plate into a "skin pass mill" from new charging table installed at Olin Mathieson Chemical Corporation’s aluminum plant to facilitate material handling of heavier gauge products. The skin pass mill reduces the thickness of plate and sheet, controls their flatness and imparts the surface finish required for their end uses. The plant near Hannibal, Ohio, has just completed a two-year, multi-million-dollar expansion program.