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| All Patents in class 209/437 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,617X | Apr. 28, 1836 | W. Davis | Sweeping and washing ores | ore processing apparatus | |
| 24,901 | Jul. 26, 1859 | J.N. Wyckoff, T.M. Fell | Ore Washer and Amalgamator | ore processing apparatus | |