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| All Patents in class 200/19.23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 144,098 | Oct. 28, 1873 | J.C. Hoadley | Governors for Steam-Engines | steam engine governors | |
| 660,338 | Oct. 23, 1900 | G.H. Rogers | Petroleum or Like Internal-Combustion Engine | internal combustion engines | |
| 2,306,549 | Dec. 29, 1942 | T.G. Louis | Automatically adjustable cam-operated ignition circuit breaker | ignition systems | |
| 2,699,657 | Jan. 18, 1955 | E.A. Vogel | Spark Advance Control Mechanism | ignition systems | |