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| Patents Granted on 1840-07-15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,690 | Jul. 15, 1840 | J. MacGregor, Jr. | Wood plane attachment | cutterhead machine accessories | |
| 1,691 | Jul. 15, 1840 | B. Cushwa | Self-adjusting log-brace for sawmills | sawmill carriages | |