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| Patents Granted on 1837-04-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 170 | Apr. 20, 1837 | G.E. Sellers | Improvement in concentrating-furnaces for smelting iron ores by the use of anthracite coal in which other kinds of fuel can be used | foundryman | |
| 171 | Apr. 20, 1837 | F. Fredly | Ore Washer | ore processing apparatus | |