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| All Patents in class 451/230 | |||||
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| Number | Date | Patentee | Title | Type | |
| 103,633 | May 31, 1870 | T. Loring | Improvement in Harvester-knife grinder | sharpening apparatus | |
| 195,700 | Oct. 02, 1877 | A. Cameron | Sickle-Grinders | sharpening machines | |