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Priority claimed from JP59174362Aexternal-prioritypatent/JPH0828079B2/ja
Priority claimed from JP59246550Aexternal-prioritypatent/JPH0640375B2/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP85305523Aexternal-prioritypatent/EP0174095B1/de
Application grantedgrantedCritical
Publication of ATE64027T1publicationCriticalpatent/ATE64027T1/de