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| All Patents in class 451/179 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,938,767 | Dec. 12, 1933 | B.A. Kearns | Grinding Machine | cylindrical grinders | |
| 2,068,529 | Jan. 19, 1937 | W.G. Baldenhofer | Grinding Machine | surface grinders | |