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| Patents Granted on 1833-03-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,495X | Mar. 21, 1833 | A. Patton | Cutting the flutes and threads of screws and nuts | ||
| 7,496X | Mar. 21, 1833 | W. Whittemore, W. Whittemore, Jr. | Separating cotton seed by a roller gin | cotton gins | |