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| All Patents in class 418/94 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 444,087 | Jan. 06, 1891 | S.E. Chapleau | Rotary Compound Steam Engine | ||
 | 711,239 | Oct. 14, 1902 | E.B. Tree | Rotary Engine | |
| 798,848 | Sep. 05, 1905 | E.C. Warren | Rotary Engine | ||