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| All Patents in class 323/201 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 596,186 | Dec. 28, 1897 | E.W. Rice, C.P. Steinmetz | Phase Regulator | |
| 1,201,837 | Oct. 17, 1916 | J.C. Lincoln | Portable Means for Securing the Reverse Flow of Electric Current | ||