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| All Patents in class 451/128 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 395,615 | Jan. 01, 1889 | R. Dutton | Machine for grinding mower-knives | |
| 481,275 | Aug. 23, 1892 | R. Dutton | Machine for grinding mower-knives | ||
 | 567,637 | Sep. 15, 1896 | A.R. Clizbe | Grinding Machine | |
 | 593,964 | Nov. 16, 1897 | C.J. Luther | Grinding Machine | |
| 636,192 | Oct. 31, 1899 | H.W. Bolens | Grinding Machine | ||
 | 650,035 | May 22, 1900 | A.R. Clizbe | Grinding Machine | |
| 655,753 | Aug. 14, 1900 | H.W. Bolens | Grinding Machine | ||
| 1,033,586 | Jul. 23, 1912 | G.W. Hoadley | Grinding Machine | ||