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Priority claimed from JP62017363Aexternal-prioritypatent/JP2519913B2/en
Priority claimed from JP3155787Uexternal-prioritypatent/JPH051424Y2/ja
Application filed by Pilot PrecisionfiledCriticalPilot Precision
Priority claimed from EP87112007Aexternal-prioritypatent/EP0276362B1/en
Application grantedgrantedCritical
Publication of ATE58872T1publicationCriticalpatent/ATE58872T1/en