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| File information | |
| Filename: | us0d0004457-001.jpg |
| Keywords: | Pittsburg / Pennsylvania / Allegheny / John Beam / John C. Stevenson |
| Inventor's Name: | James S. Atterbury & Thomas B. Atterbury |
| Patent Date: | November 8, 1870 |
| Pattern Name/Number: | Unknown |
| Original Manufacturer: | Unknown |
| Date added: | Apr 20, 2019 |