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| Patents Granted on 1849-03-20 | |||||
| Number | Date | Patentee | Title | Type | |
| 6,195 | Mar. 20, 1849 | T.J. Wells | Planing-machine | wood planers | |
| 6,210 | Mar. 20, 1849 | D.H. Chamberlain | Sliding Wrench | nut wrenches | |
| 6,211 | Mar. 20, 1849 | J.P. Woodbury | Planing-machine | wood planers | |
| 6,216 | Mar. 20, 1849 | J. Wright | Improved Machine fot Turning a Lock on Sheet Metal | tinsmith | |