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| All Patents in class 91/179 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 310,978 | Jan. 20, 1885 | J.L. Bogert | Rotary valve for steam-engines | |
| 1,590,353 | Jun. 29, 1926 | G.H. Ekstrom | Rubbing machine | ||
| 1,677,112 | Jul. 10, 1928 | S.F. Anderson | Rubbing machine | ||
| 2,251,329 | Aug. 05, 1941 | G.H. Ekstrom | Rubbing machine | ||