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| All Patents in class 123/668 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 289,693 | Dec. 04, 1883 | L.H. Nash | Gas Engine | |
| 332,312 | Dec. 15, 1885 | S. Wilcox | Air and Gas Engine | ||
| 332,315 | Dec. 15, 1885 | S. Wilcox | Gas Engine | ||
| 580,445 | Apr. 13, 1897 | F.H. Bates, F.G. Bates | Motor Engine | ||
| 599,496 | Feb. 22, 1898 | J. Fraser | Gas Engine | ||
| 607,317 | Jul. 12, 1898 | G.L. Woodworth | Internal Combustion Engine | ||