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| Patents Granted on 1830-12-28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,309X | Dec. 28, 1830 | O. Mallory | Steam engine and feeder for boiler | steam engines | |
| 6,310X | Dec. 28, 1830 | J. Pratt | Method of making ivory, bone, and wood combs | comb making machines | |