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| All Patents in class 261/DIG.6 | |||||
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| Number | Date | Patentee | Title | Type | |
| 614,114 | Nov. 15, 1898 | C.A. Lefebvre | Oil or Similar Motor | oil engines | |
| 642,562 | Jan. 30, 1900 | H.F. Probert | Vaporizer for Gas Engines | fuel systems | |