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| All Patents in class 318/272 | |||||
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| Number | Date | Patentee | Title | Type | |
| 309,536 | Dec. 23, 1884 | W.K. Freeman | Regulator for Electric Generators & Motors | motor regulators | |
| 316,092 | Apr. 21, 1885 | E. Weston | Electro Magnetic Motor | DC motors | |