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| All Patents in class 123/179.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 332,312 | Dec. 15, 1885 | S. Wilcox | Air and Gas Engine | gas and gasoline engines | |
| 437,507 | Sep. 30, 1890 | N.A. Otto | Petroleum or Oil Motor Engine | oil engines | |