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| All Patents in class 137/489.5 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,610,647 | Sep. 16, 1952 | G.F. Maglott | Pilot Operated Fluid Pressure Control Valve | ||
| 2,706,489 | Apr. 19, 1955 | T.V. Pedersen | Pressure Relief Valve | valves | |