| All Patents in class 451/122 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 342,290 | May 18, 1886 | R. Dutton | Machine for Grinding Mowing Machine Knives | sharpeners |
| 359,964 | Mar. 22, 1887 | R. Dutton | Machine for grinding mower-knives | sharpeners |
| 457,079 | Aug. 04, 1891 | R. Dutton | Machine for grinding mower-knives | sharpeners |
| 503,127 | Aug. 15, 1893 | R. Dutton | Machine for grinding mower-knives | sharpeners |
| 567,638 | Sep. 15, 1896 | A.R. Clizbe | Grinding Machine | sharpeners |
| 611,893 | Oct. 04, 1898 | A.R. Clizbe | Grinding Machine | sharpeners |
| 1,945,044 | Jan. 30, 1934 | W.M. Fairbairn, A.M. Johnson | Honing machine | honing machines |
