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| All Patents in class 123/550 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,800 | Oct. 07, 1846 | S. Perry | Gas Engine | gas and gasoline engines | |
| 439,702 | Nov. 04, 1890 | H.A. Stuart | Petroleum Engine or Motor | ||
| 552,718 | Jan. 07, 1896 | S. Priestman, W.D. Priestman | Hydrocarbon Engine | oil engines | |
| 614,114 | Nov. 15, 1898 | C.A. Lefebvre | Oil or Similar Motor | oil engines | |
| 619,776 | Feb. 21, 1899 | P. Murray | Gas Engine | gas and gasoline engines | |
| 1,110,438 | Sep. 15, 1914 | W.E. Gore | Internal Combustion Engine | gas and gasoline engines | |