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| All Patents in class 451/552 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 97,090 | Nov. 23, 1869 | W.H. Howland | Improvement in knife-sharpener | |
 | 102,218 | Apr. 26, 1870 | H. Brown | Improvement in oil-stone holders | |
 | 664,319 | Dec. 18, 1900 | M.B. Hill | Oil-stone | |
 | 985,473 | Feb. 28, 1911 | J.R. Thomas | Blade-truing device | |
| 4,259,815 | Apr. 07, 1981 | W.G. Kuban | Blade sharpener | ||
 | 5,018,315 | May 28, 1991 | L.G. Lee, F.A. McLean, J.H. Gagnon | Apparatus for holding and storing sharpening stones | |