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Priority claimed from JP4669187Uexternal-prioritypatent/JPH0512020Y2/ja
Priority claimed from JP1987120347Uexternal-prioritypatent/JPS6427216U/ja
Application filed by Sumitomo Heavy IndustriesfiledCriticalSumitomo Heavy Industries
Priority claimed from EP88902928Aexternal-prioritypatent/EP0307482B1/en
Application grantedgrantedCritical
Publication of ATE101077T1publicationCriticalpatent/ATE101077T1/en