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| Patents Granted on 1851-04-15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,036 | Apr. 15, 1851 | J.H. Baird, J. Buckingham | Milling Tool | lathe tools | |
| 8,042 | Apr. 15, 1851 | J.W. Robbins | Setting logs in sawmills | sawmills | |