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| Patents Granted on 1828-01-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,966X | Jan. 21, 1828 | S. Duncan | Vibrating machine for napping cloth | ||
| 4,967X | Jan. 21, 1828 | J.L. Comstock | Making leather and cloth water proof | ||