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Priority claimed from JP58049761Aexternal-prioritypatent/JPS59175292A/ja
Priority claimed from JP58062703Aexternal-prioritypatent/JPS59188284A/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP84302014Aexternal-prioritypatent/EP0120696B1/de
Application grantedgrantedCritical
Publication of ATE27755T1publicationCriticalpatent/ATE27755T1/de