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| Patents for John C. Douglass | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,275X | Nov. 26, 1825 | J.C. Douglass | Apparatus for distilling | distilling apparatus | |
| 6,292X | Dec. 17, 1830 | J.C. Douglass | Steam engine boilers | stationary boilers | |