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| All Patents in class 451/321 | |||||
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| Number | Date | Patentee | Title | Type | |
| 523,908 | Jul. 31, 1894 | C.N. Sly | Machine for Sharpening Shears | ||
| 5,018,315 | May 28, 1991 | L.G. Lee, F.A. McLean, J.H. Gagnon | Apparatus for holding and storing sharpening stones | ||