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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP3532377ApriorityCriticalpatent/JPS53122118A/en
Publication of JPS53122118ApublicationCriticalpatent/JPS53122118A/en
PURPOSE: To simplify its structure by sensing the differential pressure of different two locations generated due to water running and controlling the operation and stop of a pump by flow rate.