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| All Patents in class 137/491 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,393,258 | Oct. 11, 1921 | A.B. Carhart | Safety Valve | steam safety valves | |
| 2,923,306 | Feb. 02, 1960 | W.G. Mitchell | Pressure regulator valve mechanism for air tools | ||
| 3,537,356 | Nov. 03, 1970 | E.I. Odell | Hydraulic Control System | machine tool controls | |