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Priority claimed from JP61079516Aexternal-prioritypatent/JPS62236120A/ja
Priority claimed from JP61079515Aexternal-prioritypatent/JP2650244B2/ja
Priority claimed from JP61079514Aexternal-prioritypatent/JP2526545B2/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP87100060Aexternal-prioritypatent/EP0229014B1/de
Application grantedgrantedCritical
Publication of ATE87389T1publicationCriticalpatent/ATE87389T1/de