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| All Patents in class 91/261 | |||||
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| Number | Date | Patentee | Title | Type | |
| 548,753 | Oct. 29, 1895 | N.T. Greene | Steam Engine | steam engines | |
| 603,475 | May 03, 1898 | J. Stumpf | Cut-off mechanism for steam-engines | steam engine valves | |