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Priority claimed from JP1985078895Uexternal-prioritypatent/JPH048505Y2/ja
Priority claimed from JP60113782Aexternal-prioritypatent/JPH0640408B2/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP86303902Aexternal-prioritypatent/EP0203784B1/de
Application grantedgrantedCritical
Publication of ATE64030T1publicationCriticalpatent/ATE64030T1/de