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| All Patents in class 318/715 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,561,624 | Nov. 17, 1925 | H. Weichsel | Alternating-current motor | ||
| 1,570,109 | Jan. 19, 1926 | H. Weichsel | Alternating-current motor | ||
 | 3,093,782 | Jun. 11, 1963 | K.M. Sparrow | Synchronous motor | |