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| All Patents in class 209/191 | |||||
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| Number | Date | Patentee | Title | Type | |
| 25,933 | Oct. 25, 1859 | W.H. Howland | Amalgamator | ore processing apparatus | |
| 244,240 | Jul. 12, 1881 | W.H. Howland | Ore-amalgamator | ore processing apparatus | |
| 251,442 | Dec. 27, 1881 | F.A. Huntington | Grinding and amalgamating pan | ore processing apparatus | |