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Priority claimed from JP61003147Aexternal-prioritypatent/JPH07114371B2/en
Priority claimed from JP61013553Aexternal-prioritypatent/JP2578762B2/en
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP87300187Aexternal-prioritypatent/EP0229698B1/en
Application grantedgrantedCritical
Publication of ATE87155T1publicationCriticalpatent/ATE87155T1/en