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| Patents Granted on 1820-04-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,197X | Apr. 20, 1820 | R. Wilcox | Application of steam in distilling and working steam engines | distilling apparatus | |
| 3,198X | Apr. 20, 1820 | R. Wilcox | Portable rotary oven | ||