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| All Patents in class 123/73C | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 574,535 | Jan. 05, 1897 | C.L. Grohmann | Gas Engine | |
| 576,604 | Feb. 09, 1897 | L.H. Nash | Gas Engine | ||
| 580,446 | Apr. 13, 1897 | D. Best | Petroleum Engine | ||
 | 583,628 | Jun. 01, 1897 | L.H. Nash | Gas or Oil Engine | |
| 658,367 | Sep. 25, 1900 | E. Apperson, E. Haynes | Explosive Engine | ||
 | 864,877 | Sep. 03, 1907 | E.J. Woolf | Explosive Engine | |
| 1,632,988 | Jun. 21, 1927 | E.T. Adams | Internal Combustion Engine and Method of Operating the Same | ||