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Priority claimed from JP56142836Aexternal-prioritypatent/JPS5843685A/ja
Priority claimed from JP56142837Aexternal-prioritypatent/JPS5844873A/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP82304758Aexternal-prioritypatent/EP0074810B1/de
Application grantedgrantedCritical
Publication of ATE25908T1publicationCriticalpatent/ATE25908T1/de