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| Patents for T. C. Silliman | |||||
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| Number | Date | Patentee | Title | Type | |
| 75,454 | Mar. 10, 1868 | I.T. Payne | Improvement in augers | auger bits | |
| 87,796 | Mar. 16, 1869 | H.L. Shailer | Double-twist auger | drill bits | |