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| Patents Granted on 1820-09-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,234X | Sep. 20, 1820 | R.L. Stevens | Plough | plows | |
| 3,235X | Sep. 20, 1820 | J. Balthorpe (Balltlirope) | Double Shovel Plough | plows | |