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| All Patents in class 172/704 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,089X | Mar. 17, 1834 | R.B. Chenoweth | Self-sharpening plough | plows | |
| 3,052 | Apr. 15, 1843 | J. Gallatin | Improvement in Plows | plows | |