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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 | |
| 1,590,353 | Jun. 29, 1926 | G.H. Ekstrom | Rubbing machine | handheld power sanders | |
| 1,677,112 | Jul. 10, 1928 | S.F. Anderson | Rubbing machine | handheld power sanders | |
| 2,251,329 | Aug. 05, 1941 | G.H. Ekstrom | Rubbing machine | ||