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Priority claimed from JP15972383Aexternal-prioritypatent/JPS6050747A/en
Priority claimed from JP15972983Aexternal-prioritypatent/JPS6052951A/en
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP84110352Aexternal-prioritypatent/EP0138005B1/en
Application grantedgrantedCritical
Publication of ATE38448T1publicationCriticalpatent/ATE38448T1/en