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| All Patents in class 172/547 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,602X | Apr. 21, 1836 | J.C. Concklin | Harrow | harrows | |
| 79,540 | Jul. 07, 1868 | J. Armstrong | Rotary Harrow | harrows | |
| 500,253 | Jun. 27, 1893 | F. Syvrnd, A. Johnson | Revolving Harrow | harrows | |
| 1,814,003 | Jul. 14, 1931 | H.O. Lown | Gang plow | plows | |