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| Patents for J. N. Campbell | |||||
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| Number | Date | Patentee | Title | Type | |
| 147,168 | Feb. 03, 1874 | I.W. Pool | Improvement in saw-mill dogs | sawmill dogs | |
| 168,360 | Oct. 05, 1875 | E. Wiard | Wrench | nut wrenches | |