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| All Patents in class 172/257 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,373,852 | Apr. 05, 1921 | C.J. Allen | Tractor | tractors | |
| 1,776,408 | Sep. 23, 1930 | P.R. Thompson, W.I. Ball | Hitch Mechanism for Tractors | tractors | |