| Patents for Howard Campbell |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 229,715 | Jul. 06, 1880 | H. Campbell, H.N. Land | Steering Gear for Traction Engines | traction engine steering apparatus |
| 254,223 | Feb. 28, 1882 | H. Campbell, H.N. Land | Traction Engine | steam traction engines |
| 257,444 | May 02, 1882 | H. Campbell, H.N. Land | Traction Engine | steam traction engines |
| 317,722 | May 12, 1885 | H.N. Land, H. Campbell | Platform for Traction Engines | traction engine suspensions |
| 567,117 | Sep. 01, 1896 | W. Hearchel, H. Campbell | Threshing Machine | threshers and thrashers |
