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| All Patents in class 451/139 | |||||
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| Number | Date | Patentee | Title | Type | |
| 567,637 | Sep. 15, 1896 | A.R. Clizbe | Grinding Machine | sharpeners | |
| 636,192 | Oct. 31, 1899 | H.W. Bolens | Grinding Machine | sharpeners | |
| 650,035 | May 22, 1900 | A.R. Clizbe | Grinding Machine | sharpeners | |
| 655,753 | Aug. 14, 1900 | H.W. Bolens | Grinding Machine | sharpeners | |
| 3,245,176 | Apr. 12, 1966 | A.A. Muehling | Grinding machine | ||
| 3,335,525 | Aug. 15, 1967 | A.A. Muehling | Hydraulic system for grinding machines | ||