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| All Patents in class 451/539 | |||||
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| Number | Date | Patentee | Title | Type | |
| 275,561 | Apr. 10, 1883 | S.T. Wray | Polishing or buffing wheel | grinding wheels | |
| 2,027,309 | Jan. 07, 1936 | E.C. Schacht | Abrasive material | ||