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| Patents for William Johnston | |||||
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| Number | Date | Patentee | Title | Type | |
| 42,918 | May 24, 1864 | W. Johnston, E. Warren | Farriers' Tool | farrier | |
| 60,321 | Dec. 11, 1866 | J.E. Atwood | Improvement in saws | saw teeth | |
| 84,193 | Nov. 17, 1868 | J.D. Flansburgh, W. Johnston | Coffee Roaster | coffee roasters | |