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| All Patents in class 137/495 | |||||
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| Number | Date | Patentee | Title | Type | |
| 66,028 | Jun. 25, 1867 | I. Judson | Improved hydraulic-pressure regulator | ||
| 134,548 | Jan. 07, 1873 | J.C. Hoadley | Check-Valves | steam check valves | |
| 881,848 | Mar. 10, 1908 | G.W. Day | Water Relief Valve | water valves | |
| 1,693,109 | Nov. 27, 1928 | W. Ernst | Semiautomatic Valve | hydraulic valves | |
| 2,014,541 | Sep. 17, 1935 | F.W. Wappat | Pressure regulating valve | steam valves | |