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| All Patents in class 318/280 | |||||
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| Number | Date | Patentee | Title | Type | |
| 335,863 | Feb. 09, 1886 | J. Weis | Electric Motor | motor brush holders | |
| 531,790 | Jan. 01, 1895 | R. Eickemeyer | Method of operating or controlling electric motors or dynamos | ||