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Priority claimed from JP5089687Aexternal-prioritypatent/JPH0731900B2/en
Priority claimed from JP62055537Aexternal-prioritypatent/JPH0731901B2/en
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP88301917Aexternal-prioritypatent/EP0281415B1/en
Application grantedgrantedCritical
Publication of ATE95940T1publicationCriticalpatent/ATE95940T1/en