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| All Patents in class 172/555 | |||||
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| Number | Date | Patentee | Title | Type | |
| 369,163 | Aug. 30, 1887 | G.M. Clark | Disk-harrow | harrows | |
| 631,598 | Aug. 22, 1899 | M.J. Todd | Harrow | harrows | |
| 2,221,099 | Nov. 12, 1940 | G. Large | Cultivator | ||