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| All Patents in class 123/41.83 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,054,232 | Sep. 15, 1936 | P.C. Brooks, H. Schneider | Engine of Opposed Piston Type | opposed piston engines | |
| 2,703,077 | Mar. 01, 1955 | A.K. Antonsen | Engine Cylinder Structure | internal combustion engines | |