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| All Patents of Type: variable speed motors | |||||
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| Number | Date | Patentee | Title | Type | |
| 900,420 | Oct. 06, 1908 | A.A. Pifer, C.E. Ahlm | Variable Speed Motor | variable speed motors | |
| 913,691 | Mar. 02, 1909 | J. Burke | Variable-speed motor | DC motors | |