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| All Patents in class 241/237 | |||||
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| Number | Date | Patentee | Title | Type | |
| 196,082 | Oct. 16, 1877 | P.W. Gates | Ore Crusher | ore processing apparatus | |
| 356,044 | Jan. 11, 1887 | F.A. Huntington | Ore-crusher | ore processing apparatus | |