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| Patents Granted on 1823-03-06 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,667X | Mar. 06, 1823 | W. Hopkins | Machine for cleaning cotton, or cotton whipper | cotton whippers | |
| 3,668X | Mar. 06, 1823 | W.M. Dodge | Art of printing | ||
| 3,669X | Mar. 06, 1823 | A. Thayer, Jr. | Steam engine | steam engines | |