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| All Patents in class 336/213 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 375,614 | Dec. 27, 1887 | R. Eickemeyer | Sparker-coil for gas-lighting | ||
 | 422,746 | Mar. 04, 1890 | M. von Dolivo-Dobrowolsky | Electric induction apparatus or transformer | |
 | 2,279,014 | Apr. 07, 1942 | M.B. Sawyer | Electromagnetic apparatus | |