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| All Patents in class 172/223 | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,819X | Nov. 19, 1833 | C.H. McCormick | Self-sharpening, horizontal plough | plows | |
| 9,210X | Oct. 28, 1835 | J.W. Jordan | Inverting hill side and horizontal plough | plows | |