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| All Patents in class 123/525 | |||||
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| Number | Date | Patentee | Title | Type | |
| 658,594 | Sep. 25, 1900 | C.E. Miller, C.W. Shartle | Gas Engine | gas and gasoline engines | |
| 2,612,880 | Oct. 07, 1952 | C.H. Schowalter | Dual Fuel Engine | diesel engines | |