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| Patents Granted on 1815-04-04 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,289X | Apr. 04, 1815 | G. Stiles | Floating battery or steam ship | ||
| 2,290X | Apr. 04, 1815 | E. Smith, T.S. Barnum | Machine for knapping cloth | ||