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| All Patents in class 384/537 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,241,659 | Oct. 02, 1917 | E. Ritz, Jr. | Electric portable grinder | handheld grinders | |
| 2,308,472 | Jan. 12, 1943 | J.A. Smith, II | Valve seat grinding device | ||