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| All Patents in class 123/63 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,722,707 | Jul. 30, 1929 | P.A. Ritter | Diesel Engine | diesel engines | |
| 2,094,159 | Sep. 28, 1937 | H.G. Mueller | Valve Mechanism for Steam Engines | steam engine valve gear | |