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| All Patents in class 123/260 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 428,801 | May 27, 1890 | H. Campbell | Gas Motor Engine | ||
 | 583,627 | Jun. 01, 1897 | L.H. Nash | Gas Engine | |
| 1,388,969 | Aug. 30, 1921 | A. Peter | Protected Firing Mechanism for Internal Combustion Engines | ||