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| Patents for M. J. McMahon | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-39,951 | Aug. 22, 1892 | S.O. Root | Cutting Pliers | pliers | |
| 500,253 | Jun. 27, 1893 | F. Syvrnd, A. Johnson | Revolving Harrow | harrows | |