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| All Patents in class 123/41.71 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 652,724 | Jun. 26, 1900 | N.W. Perkins, Jr., C.K. Pickles | Gas Engine | ||
| 666,368 | Jan. 22, 1901 | H.F. Wallman | Internal Combustion Engine | ||
 | 683,886 | Oct. 01, 1901 | E.J. Woolf | Explosive Engine | |