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| Patents for William A. Johnson | |||||
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| Number | Date | Patentee | Title | Type | |
| 176,479 | Apr. 25, 1876 | C.R. Patterson | Improvement in planing-machines | wood planers | |
| 229,614 | Jul. 06, 1880 | W.A. Johnson | Treadle Mechanism for Dental Engine | dental apparatus | |
| 301,722 | Jul. 08, 1884 | W.A. Johnson | Dental Engine | dental apparatus | |