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| Patents for Horace H. Hayden | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,780X | Nov. 26, 1823 | H.H. Hayden | Pyroligneous oil and acid used in tanning | ||
| 3,816X | Feb. 11, 1824 | H.H. Hayden | Preventive for the decay of human teeth | ||