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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP3259676ApriorityCriticalpatent/JPS52115950A/en
Publication of JPS52115950ApublicationCriticalpatent/JPS52115950A/en
PURPOSE: To arrange to make the torque holding force of a drum type body larger than the torque transmission force to a rotating shaft without enlarging the whole drum type body.