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| Patents Granted on 1811-05-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,515X | May 21, 1811 | J.H. Hall, W. Thornton | Firearms | firearms | |
| 1,516X | May 21, 1811 | J.H. Hall, W. Thornton | Firearms | firearms | |
| 1,517X | May 21, 1811 | J. Stephens | Steam engine for propelling boats | steam engines | |