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| All Patents in class 428/325 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,949,517 | Mar. 06, 1934 | E. Van der Pyl | Antislipping tread and method of making the same | ||
| 7,429,151 | Sep. 30, 2008 | I. Hessman | Coated Inserts for Wet Milling | carbide inserts and holders | |
| 7,431,542 | Oct. 07, 2008 | I. Hessman | Coated Cutting Insert | carbide inserts and holders | |