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Priority claimed from JP61013554Aexternal-prioritypatent/JPH07112158B2/en
Priority claimed from JP61093892Aexternal-prioritypatent/JP2740163B2/en
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP87300607Aexternal-prioritypatent/EP0232093B1/en
Application grantedgrantedCritical
Publication of ATE87156T1publicationCriticalpatent/ATE87156T1/en