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| Patents for H. E. Longenecker | |||||
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| Number | Date | Patentee | Title | Type | |
| 517,344 | Mar. 27, 1894 | J.W. Lambert | Carburetor | carburetors | |
| 536,287 | Mar. 26, 1895 | J.W. Lambert | Explosive-gas engine | gas and gasoline engines | |
| 550,832 | Dec. 03, 1895 | J.W. Lambert | Gas-engine | gas and gasoline engines | |
| 624,827 | May 09, 1899 | J.W. Lambert | Apparatus for cooling gas-engine cylinders | gas and gasoline engines | |