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| Patents for Joseph T. May | |||||
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| Number | Date | Patentee | Title | Type | |
| 125,340 | Apr. 02, 1872 | A.D. Sherar | Improvement in cutter-heads | cutterheads | |
| 125,457 | Apr. 09, 1872 | A.D. Sherar | Improvement in cutter-heads | cutterheads | |