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| Patents for Isaac Doolittle | |||||
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| Picture | Number | Date | Patentee | Title | |
| 4,775X | Jun. 01, 1827 | I. Doolittle | Supplying boilers for steam engines | ||
| 5,753X | Dec. 14, 1829 | I. Doolittle | Art of charring wood for the manufacture of charcoal | ||
| 7,401X | Feb. 01, 1833 | I. Doolittle | American or domestic calendar mangle | ||