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| Patents Granted on 1842-04-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,531 | Apr. 01, 1842 | G. Henning | Self-setting cog for sawmills | sawmill dogs | |
| 2,566 | Apr. 16, 1842 | J. Sheffield | Method of setting logs for sawing boards | sawmill carriages | |
| 2,581 | Apr. 23, 1842 | J.H. Burrows | Millstone | corn grinders | |
| 2,583 | Apr. 23, 1842 | S. Widerman | Machine for Chamfering, Beveling, and Howeling Barrels, &c. | ||