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| Patents for William G. Johnston | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,039X | May 03, 1832 | W.G. Johnston | Universal mill for grinding paint, dye-stuffs, etc. | miller | |
| 8,432X | Oct. 04, 1834 | W.G. Johnston | Horse Power, Inclined Plane | animal powered apparatus | |