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| Patents for John W. Harmon | |||||
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| Number | Date | Patentee | Title | Type | |
| 234,709 | Nov. 23, 1880 | J.W. Harmon | Leveling-Instrument | levels | |
| 270,951 | Jan. 23, 1883 | J.W. Harmon | Artificer's Level | levels | |