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) |