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| Patents for Don J. Hersey | |||||
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| Number | Date | Patentee | Title | Type | |
| 419,854 | Jan. 21, 1890 | D.J. Hersey | Pipe Wrench | pipe wrenches | |
| GB-189,005,238 | Apr. 05, 1890 | D.J. Hersey | Pipe Wrench | pipe wrenches | |