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| All Patents in class 172/491 | |||||
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| Number | Date | Patentee | Title | Type | |
| 160,760 | Mar. 16, 1875 | J. Fogarty | Steam Plow | steam plows | |
| 1,155,795 | Oct. 05, 1915 | H.C. Clay | Scarifier | scarifiers | |