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| Patents Granted on 1840-03-__ | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,522 | Mar. 25, 1840 | G.W. Lawton, B.D. Whitney | Machine for stretching cloth in the process of fulling | felt making machines | |
| 1,527 | Mar. 31, 1840 | W. Bryant | Improvement in Plows | plows | |