Browse Items (1 total) Tags: Steel Mill Browse All Browse by Tag Search Items Sort by: Title Creator Date Added Steel Plant, Mansfield Ohio The plant was originally built in 1908-09 and formally opened in June of 1909 as the National Sheet Steel Co. A few months later, the company was reorganized as the National Rolling Mill Co. In 1914, the plant was bought by the Davey Brothers and… Tags: Mansfield Sheet and Tin Plate Co, Steel Mill Featured Item John Sherman - Senator (1892) Portrait of John Sherman taken in 1892 when he was serving a term as U.S. Senator from Ohio.