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| Patents Granted on 1803-04-27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 446X | Apr. 27, 1803 | B. Platt | Improvement in heating and boiling water | ||
| 447X | Apr. 27, 1803 | E. Beebe | Mode of Constructing Vessels with Crooked Keels | shipwright | |