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| Patents for Z. N. Campbell | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 121,951 | Dec. 19, 1871 | C.V. Littlepage | Improvement in methods of forming saw-teeth | |
 | 128,470 | Jul. 02, 1872 | G.M. Darley | Improved Rabbet-Plane | |