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| All Patents in class 280/467 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,701,107 | Feb. 05, 1929 | R. Hamilton | Drawbar | tractors | |
| 1,776,408 | Sep. 23, 1930 | P.R. Thompson, W.I. Ball | Hitch Mechanism for Tractors | tractors | |