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| Patents Granted on 1838-06-27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 809 | Jun. 27, 1838 | N. Walkly | Improved mode of changing the poles of electro-magnets | electric motors | |
| 810 | Jun. 27, 1838 | A. Amsden | Hydrostatic Scale | ||