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| All Patents in class 322/87 | |||||
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| Number | Date | Patentee | Title | Type | |
| 865,820 | Sep. 10, 1907 | W.J. Richards | Motor-control system | motor controls | |
| 1,118,928 | Dec. 01, 1914 | V.A. Fynn | Dynamo-electric machine | electric generators | |
| 1,643,398 | Sep. 27, 1927 | H. Weichsel | Synchronous motor | AC motors | |