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| All Patents in class 290/41 | |||||
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| Number | Date | Patentee | Title | Type | |
| 591,123 | Oct. 05, 1897 | V.G. Apple | Igniting Means for Explosive Engines | ignition systems | |
| 1,397,277 | Nov. 15, 1921 | V.A. Fynn | Ignition-switch | ||