| All Patents in class 451/349 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 79,049 | Jun. 23, 1868 | D.W. Ayres | Improved Device for Grinding Tools |
| | 290,236 | Dec. 18, 1883 | R.R. Isaac | Machine for Sharpening Mowing Machine Knives |
 | 389,291 | Sep. 11, 1888 | A. Dey | Razor-sharpening machine |
| | 1,111,191 | Sep. 22, 1914 | W.W. Steckel | Portable Saw Sharpener |
| | 1,443,150 | Jan. 23, 1923 | F. Schimmel | Grinding tool |
 | 2,549,147 | Apr. 17, 1951 | B.G. Walters | Portable knife grinder for woodworking machines |
 | 6,676,495 | Jan. 13, 2004 | M.B. Siemers, E. Irwin, L.G. Lee, L. Sevack | Power sharpening system |
