SALEM-BROSIUS CONTINUOUS GAS-FIRED HEAT TREATING LINE AT HEAT TREATMENT PLANT OF THE DUQUESNE WORKS. - Steel Duquesne Works, Heat Treatment Plant, Along Monongahela River, Duquesne, Allegheny County, PA; Steel Corporation; American Bridge Company; Defense Plant Corporation; USX Corporation; Gas Machinery Company of America; General Electric Corporation; Salem Brosius, Incorporated; Ajax Magnethermic; Medart, Incorporated; Marvel, Incorporated; Lowe, Jet, photographer; Stupich, Martin, photographer

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