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| Patents Granted on 1845-03-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,941 | Mar. 12, 1845 | J.C. Dexter | Millstone Pick | mill stone dressers | |
| 3,949 | Mar. 12, 1845 | D.C. Stone | Auger-Handle, &c. | auger handles | |