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Priority claimed from JP25218584Aexternal-prioritypatent/JPS61129989A/ja
Priority claimed from JP25218684Aexternal-prioritypatent/JPS61129990A/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP85402347Aexternal-prioritypatent/EP0183626B1/de
Application grantedgrantedCritical
Publication of ATE68653T1publicationCriticalpatent/ATE68653T1/de