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| Patents Granted on 1851-12-09 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,580 | Dec. 09, 1851 | J. Hyde | Chuck for Lathes | metal lathe chucks | |
| 8,581 | Dec. 09, 1851 | C. Ketcham | Improvement in feeding logs in sawmills | sawmill carriages | |
| 8,584 | Dec. 09, 1851 | G.W. Tolhurst | Lath-machine | lath making machines | |