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| Patents Granted on 1840-01-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,475 | Jan. 18, 1840 | C.E. Warner | Machine for turning wooden boxes | box making machines | |
| NS-7 | Jan. 25, 1840 | R. Corbet | Method of preventing chimneys from smoking | chimneys | |