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| All Patents in class 55/DIG.028 | |||||
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| Number | Date | Patentee | Title | Type | |
| 865,677 | Sep. 10, 1907 | J.W. Burkett | Gas-engine | gas and gasoline engines | |
| 1,285,265 | Nov. 19, 1918 | C.I. Longnecker | Combustion-engine | internal combustion engines | |