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Priority claimed from JP61311604Aexternal-prioritypatent/JP2545817B2/ja
Priority claimed from JP62033897Aexternal-prioritypatent/JP2615588B2/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP87311306Aexternal-prioritypatent/EP0273687B1/de
Application grantedgrantedCritical
Publication of ATE103409T1publicationCriticalpatent/ATE103409T1/de