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| Patents Granted on 1799-05-__ | |||||
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| Number | Date | Patentee | Title | Type | |
| 248X | May 08, 1799 | A.W. Duty | New Method to Cut Clay for Tile | tile cutting machines | |
| 249X | May 17, 1799 | W. Faris | Machine for raising water | water pumps | |
| 250X | May 27, 1799 | C. Gould | Machine to keep ship's distance at sea (reckoning) | mariner | |