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| All Patents in class 60/772 | |||||
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| Number | Date | Patentee | Title | Type | |
| 293,185 | Feb. 05, 1884 | H.S. Maxim | Hot Air or Gas Engine | gas and gasoline engines | |
| 408,483 | Aug. 06, 1889 | H. Hoelljes | Method of Operating Gas Engines | gas and gasoline engines | |