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| Patents Granted on 1821-03-28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,316X | Mar. 28, 1821 | R. Greaves | Top sled for cordage | rope maker | |
| 3,317X | Mar. 28, 1821 | M. Ward | Steam engines | steam engines | |
| 3,318X | Mar. 28, 1821 | N. Lindsay | Corn shelling machine | miller | |