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| All Patents in class 172/266 | |||||
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| Number | Date | Patentee | Title | Type | |
| 310,821 | Jan. 13, 1885 | W.A. Dromgold, S.N. Hench | Cultivator spring-hoe | cultivators and tillers | |
| 363,757 | May 24, 1887 | T.H. Noxon, J. Noxon | Spring locking device for drill-hoes and cultivator-teeth | ||
| 363,759 | May 24, 1887 | T.H. Noxon, J. Noxon | Spring locking device for drill-hoes and cultivator-teeth | ||