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| Patents for William N. Woodruff | |||||
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| Number | Date | Patentee | Title | Type | |
| 195,713 | Oct. 02, 1877 | M.C. Johnson | Screw-Cutting Dies | tap and die holders | |
| 368,744 | Aug. 23, 1887 | W.N. Woodruff | Shaft-key | industrial machine mechanisms | |