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Priority to JP4309876ApriorityCriticalpatent/JPS52127401A/ja
Publication of JPS52127401ApublicationCriticalpatent/JPS52127401A/ja
Publication of JPS5511199B2publicationCriticalpatent/JPS5511199B2/ja
JP4309876A1976-04-171976-04-17Tapered screw joint and device for taking out boring tool from bored hole in emergency using the joint
GrantedJPS52127401A
(en)