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| Patents Granted on 1851-12-23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,612 | Dec. 23, 1851 | W.F. Fergus, J.M. Patton | Cutter for planing-machines | cutters | |
| 8,620 | Dec. 23, 1851 | J. Zimmer | Wooden Thread Cutting Machine | woodworking horizontal borers | |