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Application filed by 日本鋼管株式会社filedCritical日本鋼管株式会社
Priority to JP3651982UpriorityCriticalpatent/JPS58137588U/ja
Publication of JPS58137588UpublicationCriticalpatent/JPS58137588U/ja
Application grantedgrantedCritical
Publication of JPS6110848Y2publicationCriticalpatent/JPS6110848Y2/ja