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| Patents for Francis Keyser | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,097 | Feb. 06, 1849 | S.A. Abbott, E. Elicott | Level-scale for canals, railroads, &c. | levels | |
| 82,131 | Sep. 15, 1868 | E.E. Lazell | Centering Device | center punches | |