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| Patents for David Howell | |||||
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| Number | Date | Patentee | Title | Type | |
| 27,804 | Apr. 10, 1860 | D. Howell | Trip-Hammer | trip and helve hammers | |
| 681,024 | Aug. 20, 1901 | D. Howell | Stump Puller | stump elevators | |