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A summary of the present state of the art of electro-hydraulic servo valves suitable for aircraft and missile application is presented. This information was obtained from direct visits to both the valve manufacturers and the valve users, namely: the missile and aircraft manufacturers. The valve manufacturers were contacted to obtain detailed design and performance data on the valves; the valve users were contacted to determine the system and valve requirements and to determir.e how adequatelydoi:10.21236/ad0070616 fatcat:ltinhpguuvbijon64ytoiwzywm