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| Patents Granted on 1804-12-31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 594X | Dec. 31, 1804 | N. Fobes (Forbes) | Machine for Boring Gun Barrels | gunsmith | |
| 595X | Dec. 31, 1804 | S. Chamberlaine | Medicine called bilious cordial | medical pills and syrups | |
| 596X | Dec. 31, 1804 | S. Janes | Mode of improving or setting a horse's ears | equestrian equipment | |