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