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| Patents for Thomas D. Mitchell | |||||
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| Number | Date | Patentee | Title | Type | |
| 79,099 | Jun. 23, 1868 | S. Barry | Improvement in saws | saw teeth | |
| 92,419 | Jul. 13, 1869 | H. Bates, D.L. Bates | Improved drill | drill presses | |