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| All Patents in class 336/197 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,696,615 | Dec. 25, 1928 | P. Trombetta | Electromagnet | motor controls | |
| 2,346,094 | Apr. 04, 1944 | E.A. Vogel | Ignition Device | ignition systems | |