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| Patents Granted on 1864-05-31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 42,961 | May 31, 1864 | W.C. Noyes | Wrench | screw adjust wrenches | |
| 42,965 | May 31, 1864 | J.D. Richardson | Improvement in sawmills | reciprocating sawmills | |
| 42,990 | May 31, 1864 | D.A. Dickinson | Improvement in machines for trimming the bowls of tobacco-pipes | specialty woodworking machines | |
| 42,991 | May 31, 1864 | D.A. Dickinson | Improvement in machines for making tobacco-pipes | specialty woodworking machines | |