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| Patents for Charles Colahan | |||||
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| Number | Date | Patentee | Title | Type | |
| 293,675 | Feb. 19, 1884 | F.P. Rosback | Metal Planer | metal planers | |
| 323,874 | Aug. 04, 1885 | H.F. Liebmann | File-cutting machine | tool making machines | |