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| Patents for M. A. Campbell | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 595,546 | Dec. 14, 1897 | W.J. O'Brien | Quick-Acting Vise | |
 | 617,501 | Jan. 10, 1899 | C.P. Fay | Center Indicator | |
| D30,856 | May 23, 1899 | L.L. Davis | Design for an electric-lamp bulb | ||
 | 627,668 | Jun. 27, 1899 | F.A. Holt | Combination Utensil | |
 | 659,461 | Oct. 09, 1900 | F.D. Van Norman | Engraving and die-sinking machine | |
 | 665,316 | Jan. 01, 1901 | C.P. Fay | Protractor | |
 | 741,743 | Oct. 20, 1903 | C.E. Van Norman | Valve for compound engine | |