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| Patents Granted on 1821-07-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,350X | Jul. 07, 1821 | R. Haskell | Navigable mercantile house | ||
| 3,352X | Jul. 08, 1821 | G.H. Richards | Travelling carriages | coaches and carriages | |
| 3,351X | Jul. 09, 1821 | J. Chapman | Loom, Manufacturing Sail Duck | textile machines | |