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Priority claimed from JP57020964Aexternal-prioritypatent/JPS58145622A/ja
Priority claimed from JP57020963Aexternal-prioritypatent/JPS58145621A/ja
Priority claimed from JP57020965Aexternal-prioritypatent/JPS58145625A/ja
Application filed by Tdk CorpfiledCriticalTdk Corp
Priority claimed from EP83101194Aexternal-prioritypatent/EP0086445B1/de
Application grantedgrantedCritical
Publication of ATE29615T1publicationCriticalpatent/ATE29615T1/de