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| All Patents in class 123/293 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 574,610 | Jan. 05, 1897 | G. Joranson | Gas Engine | |
 | 584,961 | Jun. 22, 1897 | C. Quast | Gas Engine | |
| 1,790,892 | Feb. 03, 1931 | E.T. Adams | Internal Combustion Engine | ||
| 1,907,095 | May 02, 1933 | E.T. Adams | Internal Combustion Engine | ||