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Priority claimed from JP57050183Aexternal-prioritypatent/JPS58168324A/ja
Priority claimed from JP6251582Aexternal-prioritypatent/JPS58180954A/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP83301826Aexternal-prioritypatent/EP0090667B1/de
Application grantedgrantedCritical
Publication of ATE53725T1publicationCriticalpatent/ATE53725T1/de