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| Patents Granted on 1840-02-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,486 | Feb. 08, 1840 | S. Morrill, E. Moody | Self-tending sawmill | sawmill carriages | |
| 1,491 | Feb. 18, 1840 | I. Straub | Portable grist-mill | grist mills | |
| 1,493 | Feb. 18, 1840 | W.R. Greenleaf, A. Cole | Machine for cutting veneers | veneer machines | |