This 15-foot-wide, fiberboard sign once hung outside the No. 6 Blast Furnace at the former Duquesne Steel Works. Constructed in 1963 by U.S. Steel, and nicknamed “Dorothy 6” after the wife of U.S. Steel President Leslie Worthington, the No.6 furnace became the largest and most modern of its kind in the world. Situated in the …

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