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Priority to JP6066773UpriorityCriticalpatent/JPS528418Y2/ja
Priority to US05/459,046prioritypatent/US3931643A/en
Publication of JPS507433UpublicationCriticalpatent/JPS507433U/ja
Application grantedgrantedCritical
Publication of JPS528418Y2publicationCriticalpatent/JPS528418Y2/ja