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| All Patents in class 313/125 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 424,027 | Mar. 25, 1890 | E.F. Roberts | Igniting Apparatus for Gas Engines | ||
| 541,773 | Jun. 25, 1895 | F.S. Mead | Gas Engine | ||
| 588,466 | Aug. 17, 1897 | A.G. Pace | Combustion Engine | ||
| RE11,775 | Sep. 26, 1899 | A.G. Pace | Combustion Engine | ||
| 676,468 | Jun. 18, 1901 | N. McClintock | Ignition Plug for Gas Engines | ||
| 1,401,585 | Dec. 27, 1921 | V.D. Collins, A.F. Collins | Spark Plug | ||