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| All Patents in class 451/293 | |||||
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| Number | Date | Patentee | Title | Type | |
| 59,950 | Nov. 27, 1866 | J. Borthwick | Improved Machine for Sharpening Saws | annular saws | |
| 182,284 | Sep. 19, 1876 | J.L. Otis | Planer-knife grinder | tool grinders | |
| 5,048,236 | Sep. 17, 1991 | C.C. Williams | Saw Blade Tooth Grinder for Saws | saw sharpening machines | |
| 6,676,495 | Jan. 13, 2004 | M.B. Siemers, E. Irwin, L.G. Lee, L. Sevack | Power sharpening system | ||