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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP3532577ApriorityCriticalpatent/JPS53122119A/en
Publication of JPS53122119ApublicationCriticalpatent/JPS53122119A/en
PURPOSE: To unify and miniaturize parts by sensing the differential pressure of different two water channels, stopping a pump by flow rate and more accurately starting it by the pump discharge pressure.