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