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| Patents Granted on 1852-04-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,882 | Apr. 20, 1852 | N. Blake | Submarine Auger | auger bits | |
| 8,897 | Apr. 20, 1852 | F. Wilbar | Improved Reflecting Spirit Level and Square | levels | |