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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP5974975ApriorityCriticalpatent/JPS51136260A/en
Publication of JPS51136260ApublicationCriticalpatent/JPS51136260A/en
PURPOSE:Load variation detector which provides proportionally increasing direct current control in accordance with the number of load circuit in telephone switch boads.