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| All Patents in class 451/423 | |||||
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| Number | Date | Patentee | Title | Type | |
| 944,010 | Dec. 21, 1909 | C.W. Blood | Truing device for truing shaped cutters in running cutter-heads | woodworking machine sharpening mechanisms | |
| 985,473 | Feb. 28, 1911 | J.R. Thomas | Blade-truing device | woodworking machine sharpening mechanisms | |
| 1,271,778 | Jul. 09, 1918 | C.S. Sayre | Lawn Mower Sharpener | sharpeners | |