20 янв 1865 г. - Keystone Bridge Company founded

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Founded in 1865 by Andrew Carnegie, was an American bridge building company. It was one of the 28 companies absorbed into the American Bridge Company in 1900. The company advertised its services for building steel, wrought iron, wooden railway and road bridges. It held a patent for wrought iron bridges and also supplied wrought iron columns for buildings. He used his connection to the two men (Scott and Thomson) to acquire contracts for his Keystone Bridge Company and the rails produced by his ironworks.

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