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| All Patents in class 123/90.18 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,503,383 | Jul. 29, 1924 | C.E. Sargent | Internal Combustion Engine | internal combustion engines | |
| 1,525,956 | Feb. 10, 1925 | C.E. Sargent | Internal Combustion Engine | gas and gasoline engines | |