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| Patents for E. P. Willson | |||||
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| Number | Date | Patentee | Title | Type | |
| 66,617 | Jul. 09, 1867 | P. Estes, F.J. Nutz | Governor | steam engine governors | |
| 72,828 | Dec. 31, 1867 | P. Estes | Improvement in head-blocks | sawmill headblocks | |