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Priority claimed from JP58239409Aexternal-prioritypatent/JPS60130962A/en
Priority claimed from JP59230888Aexternal-prioritypatent/JPS61109367A/en
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP84402573Aexternal-prioritypatent/EP0146472B1/en
Application grantedgrantedCritical
Publication of ATE73593T1publicationCriticalpatent/ATE73593T1/en