ROUGH GAS MAIN RUNNING SOUTHEAST FROM THE BOP SHOP TO THE DUAL VENTURI GAS WASHERS. - Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monongahela River, Duquesne, Allegheny County, PA; Steel Corporation; USX Corporation; Dorr-Oliver Company; Pecor [furnace manufacturer]; Wilson-Snyder; Allis-Chalmers; American Air Filter Company; Nash-Hytor [pump manufacturer]; Delaval [machinery manufacturer]; Stupich, Martin, photographer

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