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| Patents Granted on 1845-03-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,959 | Mar. 21, 1845 | C. Aylsworth | Water Wheel | water wheels | |
| 3,961 | Mar. 21, 1845 | B. Bicknell | Method of fastening cutters in machinery for planing lumber | cutterheads | |