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| All Patents in class 307/102 | |||||
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| Number | Date | Patentee | Title | Type | |
| 507,391 | Oct. 24, 1893 | W. Stanley, Jr., J.F. Kelly | System of electrical distribution | ||
| 549,449 | Nov. 05, 1895 | M. von Dolivo-Dobrowolsky | Apparatus for indicating difference of phase | electrical devices | |