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| All Patents in class 318/525 | |||||
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| Number | Date | Patentee | Title | Type | |
| 315,180 | Apr. 07, 1885 | F.J. Sprague | Electro Dynamic Motor | electric motors | |
| 324,891 | Aug. 25, 1885 | F.J. Sprague | Electric Dynamic Motor | DC motors | |