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Priority to JP5357074ApriorityCriticalpatent/JPS5550020B2/ja
Priority to US05/574,898prioritypatent/US4013725A/en
Priority to DE2521324Aprioritypatent/DE2521324C2/de
Publication of JPS50142526ApublicationCriticalpatent/JPS50142526A/ja
Publication of JPS5550020B2publicationCriticalpatent/JPS5550020B2/ja