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Priority claimed from GB08511649Aexternal-prioritypatent/GB2174861A/en
Priority claimed from GB8511648Aexternal-prioritypatent/GB2174860B/en
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP86303298Aexternal-prioritypatent/EP0205252B1/en
Application grantedgrantedCritical
Publication of ATE46404T1publicationCriticalpatent/ATE46404T1/en