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| All Patents in class 451/225 | |||||
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| Number | Date | Patentee | Title | Type | |
| 285,492 | Sep. 25, 1883 | G.W. King | Harvester Knife Grinder | sharpening machines | |
| 342,290 | May 18, 1886 | R. Dutton | Machine for Grinding Mowing Machine Knives | sharpeners | |