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| Patents for Thos. S. J. Douglas | |||||
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| Number | Date | Patentee | Title | Type | |
| 40,480 | Nov. 03, 1863 | S.L. Hill | Wood Clamp | ||
| 41,925 | Mar. 15, 1864 | W.M. Keague | Improvement in tools for opening boxes | combination tools | |