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| All Patents in class 73/548 | |||||
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| Number | Date | Patentee | Title | Type | |
| 296,341 | Apr. 08, 1884 | H.S. Maxim | Electrical Igniting Device for Gas Engines | ignition systems | |
| 784,818 | Mar. 14, 1905 | C.W. Weiss | Internal Combustion Engine | oil engines | |