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| All Patents in class 307/84 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 404,567 | Jun. 04, 1889 | O.B. Shallenberger | System of generators for alternating electric currents | |
 | 549,449 | Nov. 05, 1895 | M. von Dolivo-Dobrowolsky | Apparatus for indicating difference of phase | |