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Priority claimed from JP61229073Aexternal-prioritypatent/JP2517922B2/ja
Priority claimed from JP61307168Aexternal-prioritypatent/JP2517934B2/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP87114071Aexternal-prioritypatent/EP0262623B1/de
Application grantedgrantedCritical
Publication of ATE105453T1publicationCriticalpatent/ATE105453T1/de