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Application filed by 日本鋼管株式会社, 昭和工業株式会社filedCritical日本鋼管株式会社
Priority to JP14449482UpriorityCriticalpatent/JPS5949412U/ja
Publication of JPS5949412UpublicationCriticalpatent/JPS5949412U/ja
Application grantedgrantedCritical
Publication of JPH0337769Y2publicationCriticalpatent/JPH0337769Y2/ja