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| All Patents in class 307/18 | |||||
| Number | Date | Patentee | Title | Type | |
| 248,435 | Oct. 18, 1881 | T.A. Edison | Utilizing Electricity as Motive Power | DC motors | |
| 469,515 | Feb. 23, 1892 | M. von Dolivo-Dobrowolsky | Electric machine | electric distribution systems | |