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Application filed by 東芝タンガロイ株式会社, 日本鋼管株式会社filedCritical東芝タンガロイ株式会社
Priority to JP13338382UpriorityCriticalpatent/JPS5939129U/ja
Publication of JPS5939129UpublicationCriticalpatent/JPS5939129U/ja
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Publication of JPS6334818Y2publicationCriticalpatent/JPS6334818Y2/ja