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| All Patents in class 15/181 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,174,488 | Mar. 07, 1916 | R. Radinse, O. Geiger | Brush | grinding wheels | |
| 2,124,114 | Jul. 19, 1938 | A.W. L'Hommedieu | Buffing or polishing wheel | polishing and deburring wheels | |