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Priority claimed from JP58174778Aexternal-prioritypatent/JPH0746770B2/ja
Priority claimed from JP58174777Aexternal-prioritypatent/JPH0681044B2/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP84306429Aexternal-prioritypatent/EP0140567B1/de
Application grantedgrantedCritical
Publication of ATE68925T1publicationCriticalpatent/ATE68925T1/de