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| All Patents in class 322/20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 549,449 | Nov. 05, 1895 | M. von Dolivo-Dobrowolsky | Apparatus for indicating difference of phase | electrical devices | |
| 1,354,901 | Oct. 05, 1920 | V.A. Fynn | Dynamo-electric machine | AC motors | |