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| Patents Granted on 1840-09-04 | |||||
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| Number | Date | Patentee | Title | Type | |
| AI32 | Sep. 04, 1840 | L. Stebbins | Coloring maps, etc. | ||
| AI33 | Sep. 04, 1840 | I. Babbitt | Axle and gudgeon box | industrial machine mechanisms | |