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Priority claimed from JP60060889Aexternal-prioritypatent/JPH079718B2/en
Priority claimed from JP18788885Aexternal-prioritypatent/JPH0668852B2/en
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP86104025Aexternal-prioritypatent/EP0196590B1/en
Application grantedgrantedCritical
Publication of ATE76528T1publicationCriticalpatent/ATE76528T1/en