最終更新日：2025/11/27
The bridge's supports were made from Bessemer steel, which revolutionized construction by producing strong steel from molten cast iron through blasts of air that burned out carbon and other impurities.
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The bridge's supports were made from Bessemer steel, which revolutionized construction by producing strong steel from molten cast iron through blasts of air that burned out carbon and other impurities.
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