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| Patents Granted on 1811-03-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,474X | Mar. 20, 1811 | A. Quincy | Fire cavern | ||
| 1,475X | Mar. 20, 1811 | P. Sternberg | Fire places | ||
| 1,476X | Mar. 20, 1811 | L. Gale | Bark mill | bark processing machines | |