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| All Patents in class 123/389 | |||||
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| Number | Date | Patentee | Title | Type | |
| 348,998 | Sep. 14, 1886 | J.F. Place | Gas Engine | gas and gasoline engines | |
| 511,661 | Dec. 26, 1893 | C. Stein | Gas and Oil Motor Engine | ||
| 528,115 | Oct. 23, 1894 | H. Schumm | Gas or Oil Engine | gas and gasoline engines | |