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| All Patents in class 91/185 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,045,630 | Nov. 26, 1912 | J. Stumpf | Unidirectional-flow steam-engine | steam engines | |
| 1,493,650 | May 13, 1924 | G.D. Sundstrand | Rubbing machine | sanding machines | |
| 2,251,329 | Aug. 05, 1941 | G.H. Ekstrom | Rubbing machine | ||