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| All Patents in class 241/299 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,508X | Mar. 18, 1836 | J.C. Gentry | Metallic mill | miller | |
| 412,558 | Oct. 08, 1889 | A.P. Stephens | Surface for grinding and crushing | stone crushers | |