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| Patents for R. J. Campbell | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 12,122 | Jan. 02, 1855 | T.H. Burley | Dovetailing machine | |
 | RE4,019 | Jun. 07, 1870 | C.Z. Kroh | Improvement in Curtain-Knobs | |
 | 125,676 | Apr. 16, 1872 | W. Heckeet | Improvement in Devices for Changing Speed and Reversing Motion of Planing and Other Analogous Machines | |