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| All Patents in class 137/637.2 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 434,796 | Aug. 19, 1890 | E. Leslie | Throttle Valve | ||
| 486,099 | Nov. 15, 1892 | H.F. Frisbie | Valve for Steam Engines | ||
| 2,040,990 | May 19, 1936 | R.L. Goetzel, F.S. Haas | Hydraulic Control Mechanism | ||