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Priority claimed from JP1985168701Uexternal-prioritypatent/JPH0643029Y2/ja
Priority claimed from JP1985170585Uexternal-prioritypatent/JPS6278691U/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP8686308354Aexternal-prioritypatent/EP0221749B1/de
Application grantedgrantedCritical
Publication of ATE63012T1publicationCriticalpatent/ATE63012T1/de