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| All Patents in class 251/277 | |||||
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| Number | Date | Patentee | Title | Type | |
| 530,508 | Dec. 11, 1894 | H.T. Dawson | Gas Engine | gas and gasoline engines | |
| 1,595,619 | Aug. 10, 1926 | C.S. Alt, R.R. Beck | Carburetor | carburetors | |