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| Patents for William D. Arnot | |||||
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| Number | Date | Patentee | Title | Type | |
| 456,189 | Jul. 21, 1891 | W.D. Arnot | Combination Tool | nut wrenches | |
| 636,098 | Oct. 31, 1899 | W.D. Arnot | Combination Tool | rules | |
| 1,309,874 | Jul. 15, 1919 | W.D. Arnot | Combined Wrench and Pliers | screw adjust wrenches | |