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| Patents Granted on 1820-10-04 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,239X | Oct. 04, 1820 | E. Hubball (Hubbell) | Improvement in common cocks | ||
| 3,240X | Oct. 04, 1820 | W. Bald, Jr. | Machine for spinning cotton | spinner | |