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| All Patents in class 172/259 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,734,718 | Nov. 05, 1929 | F.V. Donald | Transmission unit | ||
| 2,221,099 | Nov. 12, 1940 | G. Large | Cultivator | ||
| 2,228,723 | Jan. 14, 1941 | G. Large | Plow | ||