Formed in 1865 by Andrew Carnegie.
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More information
Sites 3
Facsimile of the company catalogue published around 1874.
Photographic records of three bridges constructed by Keystone.
Full text of case before the U.S. Supreme Court in 1877. Concerns the infringement of two patents belonging to the company.
Photographic records of three bridges constructed by Keystone.
Facsimile of the company catalogue published around 1874.
Full text of case before the U.S. Supreme Court in 1877. Concerns the infringement of two patents belonging to the company.
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- Recently edited by merlin1
- Recently edited by merlin1