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| All Patents in class 123/80D | |||||
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| Number | Date | Patentee | Title | Type | |
| 436,936 | Sep. 23, 1890 | J.W. Eisenhuth | Explosive Engine | ||
| 545,553 | Sep. 03, 1895 | H. Thau | Electric Igniting Apparatus for Gas Engines | ignition systems | |
| 589,150 | Aug. 31, 1897 | J.C. Wilson | Gas Engine | gas and gasoline engines | |
| 657,810 | Sep. 11, 1900 | W.E. Cary | Gas Engine | gas and gasoline engines | |