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| All Patents in class 91/350 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,042 | Apr. 10, 1843 | J. Nasmyth | Machinery or apparatus operated by steam for forging, stamping, and cutting iron and other substances | steam hammers | |
| 430,311 | Jun. 17, 1890 | J.W. Eisenhuth | Cut-Off for Compound Engines | steam engines | |
| 679,637 | Jul. 30, 1901 | E.E. Redfield | Engine | ||
| 2,234,647 | Mar. 11, 1941 | O.A. Kehle | Fluid motor | pneumatic tools | |
| 2,251,329 | Aug. 05, 1941 | G.H. Ekstrom | Rubbing machine | ||