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Priority claimed from JP62280393Aexternal-prioritypatent/JPH063069B2/en
Priority claimed from JP62305749Aexternal-prioritypatent/JPH0647874B2/en
Application filed by Kumagai Gumi Co LtdfiledCriticalKumagai Gumi Co Ltd
Priority claimed from EP88309221Aexternal-prioritypatent/EP0315323B1/en
Application grantedgrantedCritical
Publication of ATE67267T1publicationCriticalpatent/ATE67267T1/en