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| All Patents in class 451/24 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,898,771 | Aug. 12, 1975 | M.L. Kuniholm | Grinding Machine | hydraulic apparatus | |
| 4,262,455 | Apr. 21, 1981 | R. Rettew | Head Positioning for a Belt Grinder | surface grinders | |
| 4,292,767 | Oct. 06, 1981 | J.J. Fatula | Belt grinder for grinding non-circular workpiece | metal sanding machines | |