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