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| All Patents in class 180/6.64 | |||||
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| Number | Date | Patentee | Title | Type | |
| 484,828 | Oct. 25, 1892 | D.S. Stewart | Traction Engine | traction engine tracks | |
| 1,768,645 | Jul. 01, 1930 | P.R. Thompson, O. Thomas | Tractor | tractors | |