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| All Patents in class 336/212 | |||||
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| Number | Date | Patentee | Title | Type | |
| 375,614 | Dec. 27, 1887 | R. Eickemeyer | Sparker-coil for gas-lighting | ||
| 433,702 | Aug. 05, 1890 | N. Tesla | Electrical transformer or induction device | ||
| 2,346,094 | Apr. 04, 1944 | E.A. Vogel | Ignition Device | ignition systems | |