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| All Patents in class 123/256 | |||||
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| Number | Date | Patentee | Title | Type | |
| RE10,290 | Feb. 20, 1883 | L.C. Parker | Gas Engine | gas and gasoline engines | |
| 1,877,737 | Sep. 13, 1932 | M.J. Goldberg | Combustion Chamber | oil engines | |