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| All Patents in class 451/212 | |||||
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| Number | Date | Patentee | Title | Type | |
| 990,373 | Apr. 25, 1911 | H.J. Mitchell | Planer-knife sharpener | woodworking machine sharpening mechanisms | |
| 1,261,669 | Apr. 02, 1918 | W.E. Wright | Sawing Apparatus | ||
| 2,252,877 | Aug. 19, 1941 | C. Baldenhofer | Way Grinding Machine | surface grinders | |