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| All Patents in class 451/487 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,575,968 | Mar. 09, 1926 | W.L. Bryant | Grinding machine | grinders | |
| 5,050,352 | Sep. 24, 1991 | M.R. Estabrook, C.R. Van Sickle | Honing stone assembly | honing machines | |