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| All Patents in class 172/256 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,585,944 | May 25, 1926 | G.T. Strite | Self-cleaning hoe | ||
| 1,768,673 | Jul. 01, 1930 | F.V. Donald | Tractor | ||
| 1,811,175 | Jun. 23, 1931 | F.V. Donald | Ground cultivating machine | ||