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| All Patents in class 451/371 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 614,247 | Nov. 15, 1898 | H. Goldsmith, E.T. Goodhew | Grinding Machine | ||
 | 1,168,047 | Jan. 11, 1916 | W.J. Bauer | Razor Blade Sharpener | |
| 1,252,367 | Jan. 01, 1918 | A.G. Hug, C.A. Scott | Razor Blade Sharpener | ||
 | 4,733,501 | Mar. 29, 1988 | F.A. McLean | Honing guide | |