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Priority claimed from JP9510080Aexternal-prioritypatent/JPS5721188A/ja
Priority claimed from JP55121051Aexternal-prioritypatent/JPS5745786A/ja
Priority claimed from JP55121050Aexternal-prioritypatent/JPS5745785A/ja
Priority claimed from JP56059870Aexternal-prioritypatent/JPS57176511A/ja
Priority claimed from JP56059871Aexternal-prioritypatent/JPS57176887A/ja
Priority claimed from JP56059872Aexternal-prioritypatent/JPS57176888A/ja
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority claimed from EP81303210Aexternal-prioritypatent/EP0044687B1/de
Application grantedgrantedCritical
Publication of ATE18616T1publicationCriticalpatent/ATE18616T1/de