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| Patents Granted on 1838-04-07 | |||||
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| Number | Date | Patentee | Title | Type | |
| AI5 | Apr. 07, 1838 | J.G. Webb | Worm for Stills | distilling apparatus | |
| 681 | Apr. 07, 1838 | R. Daniels | Crosscut eclipse shearing-machine for shearing woolen cloths | cloth shearing machines | |
| 684 | Apr. 07, 1838 | T. Burdick, F. Burdick | Machine for mortising timber, &c. | mortising machines | |
| 685 | Apr. 07, 1838 | I. McLaughlin | Machine for mortising timber, &c. | mortising machines | |