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| All Patents in class 180/319 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,162,728 | Nov. 30, 1915 | C.E. Sargent | Rein Controlled Device | tractor steering apparatus | |
| 1,270,480 | Jun. 25, 1918 | L. McCloskey | Tractor | tractors | |
| 1,671,396 | May 29, 1928 | P.R. Thompson, W.I. Ballentine | Rein Guide | tractor steering apparatus | |