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| All Patents in class 91/221 | |||||
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| Number | Date | Patentee | Title | Type | |
| 47,359 | Apr. 18, 1865 | J. Jackman, Jr. | Steam Cut-Off | ||
| 195,804 | Oct. 02, 1877 | A. Cunningham | Auromatic Expansion Gearing for Steam Engines | steam engine governors | |
| 483,643 | Oct. 04, 1892 | L.H. Wattles, G.F. Corliss | Steam Engine Governor | steam engine governors | |