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| All Patents in class 409/63 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,111,784 | Mar. 22, 1938 | A.M. Johnson | Honing machine | honing machines | |
| 2,254,508 | Sep. 02, 1941 | H.B. Barrett | Honing Tool | honing tools | |