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| All Patents in class 123/198F | |||||
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| Number | Date | Patentee | Title | Type | |
| 637,298 | Nov. 21, 1899 | G.S. Strong | Gas Engine | gas and gasoline engines | |
| 1,283,780 | Nov. 05, 1918 | R.M. Hvid | Compression Release | oil engines | |