Formed in 1865 by Andrew Carnegie.
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.
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.
Last update:January 2, 2007 at 18:00:38 UTC