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| Patents for R. J. Campbell | |||||
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| Number | Date | Patentee | Title | Type | |
| 12,122 | Jan. 02, 1855 | T.H. Burley | Dovetailing machine | dovetailing machines | |
| 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 | metal planers | |