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| Patents for Frank Leo Delfer | |||||
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| Number | Date | Patentee | Title | Type | |
| 133,422 | Nov. 26, 1872 | F.L. Delfer | Wrenches | quick adjust wrenches | |
| 150,301 | Apr. 28, 1874 | F.L. Delfer | Wrenches | axle nut wrenches | |