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| Patents Granted on 1798-04-27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 207X | Apr. 27, 1798 | J. Martin | Regulation of tide action on spiral wheel | tide mills | |
| 208X | Apr. 27, 1798 | M.J. Brunell | Raising Water | water pumps | |