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| Patents for D. W. Howard | |||||
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| Number | Date | Patentee | Title | Type | |
| 31,605 | Mar. 05, 1861 | G. Ives | Saw Buck | work supports | |
| 173,451 | Feb. 15, 1876 | E.C. Dicey | Improvement in saw-mill dogs | sawmill dogs | |
| 185,706 | Dec. 26, 1876 | W.P. Tullock | Improvement in centering devices | layout tools | |