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| All Patents in class 318/251 | |||||
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| Number | Date | Patentee | Title | Type | |
| 295,454 | Mar. 18, 1884 | F.J. Sprague | Electro Dynamic Motor | electric motors | |
| 1,084,590 | Jan. 13, 1914 | H.L. Zabriskie | Electric motor | ||