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| All Patents in class 174/152S | |||||
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| Picture | Number | Date | Patentee | Title | |
| 582,540 | May 11, 1897 | O. Mueller | Igniter for Explosive Engines | ||
| 660,786 | Oct. 30, 1900 | E.T. Birdsall | Sparking-Plug for Explosive-Engines | ||
| 676,468 | Jun. 18, 1901 | N. McClintock | Ignition Plug for Gas Engines | ||