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Priority claimed from JP63043184Aexternal-prioritypatent/JP2679084B2/ja
Priority claimed from JP63156211Aexternal-prioritypatent/JP2663524B2/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP89301171Aexternal-prioritypatent/EP0330332B1/de
Application grantedgrantedCritical
Publication of ATE98042T1publicationCriticalpatent/ATE98042T1/de