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Priority claimed from JP19853086Aexternal-prioritypatent/JP2637958B2/ja
Priority claimed from JP19853186Aexternal-prioritypatent/JPH0770149B2/ja
Priority claimed from JP61232512Aexternal-prioritypatent/JP2586461B2/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP87904952Aexternal-prioritypatent/EP0278006B1/de
Application grantedgrantedCritical
Publication of ATE105646T1publicationCriticalpatent/ATE105646T1/de