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| All Patents in class 418/146 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 448,213 | Mar. 17, 1891 | M.P. Elgen | Rotary Engine | ||
| 459,424 | Sep. 15, 1891 | G.A. Thomson | Rotary Engine | ||
| 460,522 | Sep. 29, 1891 | M.J. Bretherton | Rotary Engine | ||
 | 616,643 | Dec. 27, 1898 | E.B. Tree | Rotary Engine | |