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| All Patents in class 318/527 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 295,454 | Mar. 18, 1884 | F.J. Sprague | Electro Dynamic Motor | ||
| 315,179 | Apr. 07, 1885 | F.J. Sp | Electric Dynamic Motor | ||
| 315,181 | Apr. 07, 1885 | F.J. Sprague | Electric Motor and Generator | ||
 | 335,781 | Feb. 09, 1886 | F.J. Sprague | Electric Dynamic Motor | |