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| Patents Granted on 1822-04-13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,493X | Apr. 13, 1822 | B. Maltby | Domestic looms | looms | |
| 3,494X | Apr. 13, 1822 | E. Williams | Covering of rollers for sizing | ||
| 3,495X | Apr. 13, 1822 | S. Dew | Mapping instrument, or universal compass | surveyor | |