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Priority claimed from JP63136665Aexternal-prioritypatent/JPH0797420B2/en
Priority claimed from JP63327535Aexternal-prioritypatent/JP2578654B2/en
Application filed by Asahi Seiko Co LtdfiledCriticalAsahi Seiko Co Ltd
Priority claimed from EP89201380Aexternal-prioritypatent/EP0345868B1/en
Application grantedgrantedCritical
Publication of ATE93076T1publicationCriticalpatent/ATE93076T1/en