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| All Patents in class 123/197.3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 466,331 | Jan. 05, 1892 | H.T. Dawson | Gas Engine | gas and gasoline engines | |
| 607,878 | Jul. 26, 1898 | C. Quast | Gas Engine | gas and gasoline engines | |