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Priority claimed from JP1987096259Uexternal-prioritypatent/JPH051003Y2/ja
Priority claimed from JP62163285Aexternal-prioritypatent/JP2521961B2/en
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP88305694Aexternal-prioritypatent/EP0296829B1/en
Application grantedgrantedCritical
Publication of ATE101294T1publicationCriticalpatent/ATE101294T1/en