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| Patents Granted on 1821-08-08 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,356X | Aug. 08, 1821 | A. Thayer, Jr. | Steam wheel | rotary steam engines | |
| 3,357X | Aug. 08, 1821 | J.W. Moore | Machine for Sweeping Chimneys | chimney sweepers | |