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| All Patents in class 137/630.11 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,176,417 | Mar. 21, 1916 | R. Wood | Counter Pressure Valve | steam engine valves | |
| 1,516,102 | Nov. 18, 1924 | L. Kassander | Balanced Valve | steam engine valves | |