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| Patents for O. P. Williams | |||||
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| Number | Date | Patentee | Title | Type | |
| 133,423 | Nov. 26, 1872 | A.W. Diefendorf, A.L. Demmon | Machinists' Vises | ||
| 858,430 | Jul. 02, 1907 | E.J. Wheeler | Boring-machine | wood drilling and boring | |