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Priority claimed from JP62029353Aexternal-prioritypatent/JP2576485B2/ja
Priority claimed from JP62049818Aexternal-prioritypatent/JPS63215287A/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP88301036Aexternal-prioritypatent/EP0278717B1/de
Application grantedgrantedCritical
Publication of ATE98587T1publicationCriticalpatent/ATE98587T1/de