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Priority claimed from JP60283263Aexternal-prioritypatent/JPH0716162B2/ja
Priority claimed from JP60289865Aexternal-prioritypatent/JPH0691392B2/ja
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP86309872Aexternal-prioritypatent/EP0228245B1/de
Application grantedgrantedCritical
Publication of ATE54782T1publicationCriticalpatent/ATE54782T1/de