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| All Patents in class 123/303 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 453,071 | May 26, 1891 | I.F. Allman | Gas Engine | |
| 3,407,790 | Oct. 29, 1968 | M.L. Foreman, A.K. Antonsen | Uniflow Scavenged Engine Having Improved Gaseous Fuel Admission | ||