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| All Patents in class 123/81C | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,198,061 | Sep. 12, 1916 | C.E. Sargent | Internal Combustion Engine | internal combustion engines | |
| 2,444,103 | Jun. 29, 1948 | J.G. Kuhn | Sleeve Valve Internal-Combustion Engine | internal combustion engine valves | |