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| All Patents in class 307/9.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 397,424 | Feb. 05, 1889 | H.N. Weidner, W.W. Griscom | Connection of Electrical Circuits | ||
| 434,489 | Aug. 19, 1890 | E. Thomson | Electric Power System | ||
| 1,201,837 | Oct. 17, 1916 | J.C. Lincoln | Portable Means for Securing the Reverse Flow of Electric Current | ||