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| All Patents in class 418/99 | |||||
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| Number | Date | Patentee | Title | Type | |
| 208,298 | Sep. 24, 1878 | J. Darling | Rotary- Engines | rotary steam engines | |
| 314,389 | Mar. 24, 1885 | J.L. Mitchell | Rotary Engine | rotary steam engines | |
| 455,863 | Jul. 14, 1891 | A. Cleland | Rotary Engine | rotary steam engines | |