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| All Patents in class 235/26 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,359 | Apr. 17, 1849 | J. Tremper | Piston-ring and method of deriving motion therefrom in rotary engines | rotary steam engines | |
| 1,039,565 | Sep. 24, 1912 | C.D. McDonald | Metal-working machine | ||