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| All Patents in class 388/808 | |||||
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| Number | Date | Patentee | Title | Type | |
| 448,326 | Mar. 17, 1891 | R. Eickemeyer | Method of and apparatus for developing mechanical motion from electrical energy | ||
| 913,691 | Mar. 02, 1909 | J. Burke | Variable-speed motor | DC motors | |