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| All Patents in class 451/278 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,231,238 | Jun. 26, 1917 | R.L. Carter | Gage | sanding machines | |
| 1,679,413 | Aug. 07, 1928 | H.R. Isler, L.F. Nenninger, S. Einstein | Cutter Grinder | tool grinders | |
| 1,938,548 | Dec. 05, 1933 | H.E. Tautz | Machine table extension | tablesaws | |
| 2,118,912 | May 31, 1938 | J.B. Armitage | Cutter Grinder | tool grinders | |
| 6,676,495 | Jan. 13, 2004 | M.B. Siemers, E. Irwin, L.G. Lee, L. Sevack | Power sharpening system | ||