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| Patents Granted on 1820-08-03 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,221X | Aug. 03, 1820 | J. Deneale | Instrument for mapping lands | surveyor | |
| 3,222X | Aug. 03, 1820 | R.P. Cunningham | Spiral helm wheel | ||