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| Patents Granted on 1830-06-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,030X | Jun. 12, 1830 | D. Klauberg | Spring scale | ||
| 6,031X | Jun. 12, 1830 | J. Peters | Thrashing machine | threshers and thrashers | |