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| Patents for Howard Campbell | |||||
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| Picture | Number | Date | Patentee | Title | |
| 229,715 | Jul. 06, 1880 | H.N. Land, H. Campbell | Steering Gear for Traction Engines | ||
| 254,223 | Feb. 28, 1882 | H. Campbell, H.N. Land | Traction Engine | ||
| 257,444 | May 02, 1882 | H. Campbell, H.N. Land | Traction Engine | ||
| 317,722 | May 12, 1885 | H.N. Land, H. Campbell | Platform for Traction Engines | ||
| 567,117 | Sep. 01, 1896 | W. Hearchel, H. Campbell | Threshing Machine | ||