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| All Patents in class 172/81 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,041,980 | Oct. 22, 1912 | A.J. Dremel | Rotary cultivator | cultivators and tillers | |
| 1,641,207 | Sep. 06, 1927 | G.T. Strite | Cultivating means | ||
| 1,655,044 | Jan. 03, 1928 | H.W. Bolens, G.T. Strite, C.J. Travers | Hoe arrangement | ||
| 1,768,673 | Jul. 01, 1930 | F.V. Donald | Tractor | ||