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| All Patents in class 180/425 | |||||
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| Number | Date | Patentee | Title | Type | |
| 73,051 | Jan. 07, 1868 | H. Morrison, T. Scheffler | Traction Engine | steam traction engines | |
| 314,924 | Mar. 31, 1885 | C. Ervin | Traction Engine | traction engine steering apparatus | |
| 453,368 | Jun. 02, 1891 | E. Howland | Steam Steering Gear for Vehicles | traction engine steering apparatus | |