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| All Patents in class 451/281 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,231,920 | Jul. 03, 1917 | T. Lumsden | Tool Holder for Grinding Machines | sharpening tool holders | |
| 1,268,967 | Jun. 11, 1918 | J.W. Hampton | Grinding Machine | ||
| 1,281,001 | Oct. 08, 1918 | C.R. Hazel | Grinding and Polishing Machine | polishing and buffing machinery | |
| 1,689,274 | Oct. 30, 1928 | H.H. Asbridge | Grinding of Gear-Wheel Teeth | gear grinding machines | |
| 2,963,831 | Dec. 13, 1960 | G.J. Voelz | Sanding machine | belt sanders | |