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| All Patents in class 241/300 | |||||
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| Number | Date | Patentee | Title | Type | |
| 412,558 | Oct. 08, 1889 | A.P. Stephens | Surface for grinding and crushing | stone crushers | |
| 1,974,215 | Sep. 18, 1934 | A.J. Kilmer | Cutting Tool | lathe tools | |