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| All Patents in class 313/137 | |||||
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| Number | Date | Patentee | Title | Type | |
| 352,796 | Nov. 16, 1886 | C.W. Baldwin | Electrical Igniter for Gas Engines | ignition systems | |
| RE10,878 | Nov. 01, 1887 | J.C. Beckfeld, A. Schmid | Gas Engine | gas and gasoline engines | |
| 376,212 | Jan. 10, 1888 | H.K. Shanck | Gas Engine | gas and gasoline engines | |
| 660,786 | Oct. 30, 1900 | E.T. Birdsall | Sparking-Plug for Explosive-Engines | spark plugs | |
| 676,468 | Jun. 18, 1901 | N. McClintock | Ignition Plug for Gas Engines | spark plugs | |