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| All Patents in class 451/246 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,088,249 | May 07, 1963 | J.W. Sjostrom, L.B. Pope | Grinding Machine | grinders | |
| 3,330,074 | Jul. 11, 1967 | A.D. Stuckey | Machine Tool Backrest | metalworking machine mechanisms | |