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| All Patents in class 251/117 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,869,411 | Aug. 02, 1932 | J. De Mooy | Automatic Coupling Valve | ||
| 2,417,217 | Mar. 11, 1947 | H. Schreck | Fluid Flow Control Device | ||
| 2,682,748 | Jul. 06, 1954 | W. Ernst | Restrictor Valve for a Servomotor Circuit | ||