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| All Patents in class 451/479 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,795,089 | Jun. 11, 1957 | E.Y. Seborg | Honing machine | ||
| 2,819,566 | Jan. 14, 1958 | A.M. Johnson | Hone expansion control mechanism | ||