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| Patents Granted on 1831-07-28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,673X | Jul. 28, 1831 | J. Bolton | Bolt for separating clover chaff from straw | threshers and thrashers | |
| 6,674X | Jul. 28, 1831 | W.H. Horstman | Nets for horses | ||