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| All Patents in class 492/31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,094,361 | Apr. 21, 1914 | J.C. Blevney | Polishing device | ||
| 2,723,505 | Nov. 15, 1955 | F.G. Krafft | Method and Apparatus for Surface Finishing | surface grinders | |