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Priority claimed from JP15370781Aexternal-prioritypatent/JPS5856258A/ja
Priority claimed from JP15370381Aexternal-prioritypatent/JPS5856257A/ja
Priority claimed from JP56153701Aexternal-prioritypatent/JPH0616340B2/ja
Priority claimed from JP3636882Aexternal-prioritypatent/JPS58155573A/ja
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority claimed from EP82109013Aexternal-prioritypatent/EP0075948B1/de
Application grantedgrantedCritical
Publication of ATE24981T1publicationCriticalpatent/ATE24981T1/de