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| All Patents in class 172/427 | |||||
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| Number | Date | Patentee | Title | Type | |
| 838,478 | Dec. 11, 1906 | M.J. Todd | Road-Scarifer | scarifiers | |
| 1,342,479 | Jun. 08, 1920 | I.A. Weaver | Light-tractor gang-plow | plows | |