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| Patents for Daniel H. Southworth | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,827 | Dec. 10, 1850 | D.H. Southworth | Planing-machine | wood planers | |
| 7,942 | Feb. 18, 1851 | D.H. Southworth | Planing-machine | wood planers | |