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Hitachi Ltd
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Hitachi Ltd
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Publication date
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP3533977ApriorityCriticalpatent/JPS53122105A/en
Publication of JPS53122105ApublicationCriticalpatent/JPS53122105A/en
PURPOSE: To prevent something foreign from entering a valve device during pumping up and remove it with ease by smoothly keeping the operation of the valve device set up in a water channel.