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| All Patents in class 123/150 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 383,775 | May 29, 1888 | C. Sintz | Gas Engine | |
| 654,693 | Jul. 31, 1900 | H. Wegelin | Electrical Igniter for Hydrocarbon-Engines | ||
| 657,760 | Sep. 11, 1900 | I.H. Davis | Electric Igniter for Explosive-Engines | ||