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| Patents for James P. Espy | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,588X | May 22, 1833 | J.P. Espy | Paddle-wheels of steam and horse boats | nautical propulsion apparatus | |
| 7,625X | Jun. 29, 1833 | J.P. Espy | Chimney cap for increasing draught in furnaces | steamboats | |