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  8. Keystone Bridge Company  3 Sites
Formed in 1865 by Andrew Carnegie.
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Keystone Bridge Co. v Phoenix Iron Co. - Full text of case before the U.S. Supreme Court in 1877. Concerns the infringement of two patents belonging to the company. Descriptive Catalogue of Wrought-Iron Bridges - Facsimile of the company catalogue published around 1874. Historic Bridges of the Midwest - Photographic records of three bridges constructed by Keystone.
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