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| All Patents in class 440/49 | |||||
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| Number | Date | Patentee | Title | Type | |
| FX-6,844 | Nov. 20, 1831 | B.M. Smith | Propeller Screw | ||
| 2,400 | Dec. 23, 1841 | T.J. Wells | Improvement in the manner of constructing and of propelling steamboats, denominated the "buoyant spiral propeller" | steamboats | |