| http://www.w3.org/ns/prov#value | - ATTORNEYS U.S. PATENT 3,522,817 MULTIPLE DETECTOR PRESSURE CONTROL VALVE This invention relates to pressure control valves, and more particularly to such a device that is operated responsive to a plurality of detected pressure signals. i In general, the apparatus of the present invention comprises a multiple spool pressure control valve which includes a main control amplifier spool element thatis
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