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| All Patents in class 137/558 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 85,792 | Jan. 12, 1869 | G.H. Clemens | Improvement in steam safety-valves | |
 | 206,259 | Jul. 23, 1878 | E.S. Prime | Improvement in Wantage Rods | |
| 711,398 | Oct. 14, 1902 | B.M. Hanson | Fluid Operated Stop Valve and Alarm | ||
| 1,147,835 | Jul. 27, 1915 | R. Wood | Low Water Alarm for Steam Boilers and the Like | ||
| 1,464,669 | Aug. 14, 1923 | G.W. Stetson | Water regulator | ||
| 1,948,725 | Feb. 27, 1934 | J.D. McClintock | Safey Connection | ||