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| Patents Granted on 1803-03-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 436X | Mar. 21, 1803 | J. Cottle | Machine for Cleaning Clover Seed | miller | |
| 437X | Mar. 21, 1803 | D.F. Launy | Improvement in time pieces | clockmaker | |