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| Patents for John A. Campbell | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 449,950 | Apr. 07, 1891 | L.J. Gregor, J.F. Rodgers | Sandpapering-head | |
 | 1,195,555 | Aug. 22, 1916 | J.A. Campbell | Floor dressing and polishing machine | |
 | 1,279,082 | Sep. 17, 1918 | J.A. Campbell | Dressing-machine for floors, &c. | |
 | 1,523,049 | Jan. 13, 1925 | J.A. Campbell | Surfacing machine | |