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| All Patents in class 425/542 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,941 | Mar. 12, 1845 | J.C. Dexter | Millstone Pick | mill stone dressers | |
| 3,184,810 | May 25, 1965 | J.H. Hoern | Die casting and pressure molding machines | foundryman | |