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Nomenclature: National Tube Works to
United States Steel Corporation

          1870 - National Tube Works

          1891 - National Tube Works Company

          1899 - National Tube Company

          1901 - United States Steel Corporation
                     (Subsidiary)

          1951 - United States Steel Corporation
                     (Division)

          1964 - United States Steel Corporation
                     (Tubular Operations)

          1969 - United States Steel Corporation
                     (National-Duquesne Works)

          1970 - United States Steel Corporation
                     (Eastern Steel Operations)