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| All Patents in class 418/235 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,199,229 | Sep. 26, 1916 | B.F. Augustine | Rotary Explosion Engine | |
| 1,859,618 | May 24, 1932 | W.W. Cleland | Rotary Internal Combustion Engine | ||