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| Patents for Byron Sprague | |||||
| Number | Date | Patentee | Title | Type | |
| 42,216 | Apr. 05, 1864 | W.T. Nicholson | Improvement in File Cutting Machines | tool making machines | |
| 42,217 | Apr. 05, 1864 | W.T. Nicholson | Improvement in File Cutting Machines | tool making machines | |