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| All Patents in class 74/3.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 23,521 | Apr. 05, 1859 | D.A. Woodbury | Variable cut-off for steam-engines | steam engines | |
| 27,431 | Mar. 13, 1860 | A. Crosby | Induction-valve gear for steam-engines | ||
| 430,528 | Jun. 17, 1890 | W.O. Knowlson | Valve Gear for Engines | steam engine valve gear | |