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