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| Patents Granted on 1842-05-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,629 | May 20, 1842 | R.M. Hoe | Double-cylinder printing-press | printer | |
| 2,632 | May 20, 1842 | I. Sheetz | Mill for sawing fellies and other circular stuff | wheelwright | |