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| Patents for Roswell King | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,155X | Nov. 21, 1809 | R. King | Machine for cleaning rice | ||
| 6,138X | Oct. 01, 1830 | R. King | Separating Gold by a Vibrating Circular Cylindrical Trough | ||
| 6,139X | Oct. 01, 1830 | R. King | Vertical cylindrical gold washer | ||