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| Patents Granted on 1828-02-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,997X | Feb. 12, 1828 | P. Pratt | Grailing machine | ||
| 4,998X | Feb. 12, 1828 | P. Pratt | Machine for slitting ivory plates for combs | ||