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| All Patents in class 451/232 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 193,437 | Jul. 24, 1877 | V.F. Prentice, E.J. Worcester | Improvement in machines for grinding mower and reaper knives | |
 | 583,443 | Jun. 01, 1897 | H. Allen | Mowing-machine sharpener | |