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| Patents for Henry Knowlton | |||||
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| Number | Date | Patentee | Title | Type | |
| 167,261 | Aug. 31, 1875 | H. Knowlton | Improvement in log-turners | sawmill log handling | |
| 332,161 | Dec. 08, 1885 | J.S. Miller, E. Lapham | Saw-mill | band sawmills | |