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| All Patents in class 322/52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 597,418 | Jan. 18, 1898 | F.A. Johnson | Regulation of dynamo-electric machinery | electric motors | |
| 672,419 | Apr. 16, 1901 | F.A. Johnson | Means for Controlling Electric Motors | motor controls | |