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| All Patents in class 91/179 | |||||
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| Number | Date | Patentee | Title | Type | |
| 310,978 | Jan. 20, 1885 | J.L. Bogert | Rotary valve for steam-engines | steam engine valves | |
| 2,251,329 | Aug. 05, 1941 | G.H. Ekstrom | Rubbing machine | ||