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| Patents for C. P. Elwell | |||||
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| Number | Date | Patentee | Title | Type | |
| 266,343 | Oct. 24, 1882 | E.M. Birdsall | Traction Engine | steam traction engines | |
| 489,822 | Jan. 10, 1893 | G.W. Martin | Wrench | quick adjust wrenches | |