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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP3533677ApriorityCriticalpatent/JPS53122121A/en
Publication of JPS53122121ApublicationCriticalpatent/JPS53122121A/en
PURPOSE: To ascertain its operation by sensing the differential pressure of different two water channels, stopping a pump by minute flow rate and increasing the differential pressure.