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Priority to JP6101573UpriorityCriticalpatent/JPS528419Y2/ja
Priority to US05/459,046prioritypatent/US3931643A/en
Publication of JPS508914UpublicationCriticalpatent/JPS508914U/ja
Application grantedgrantedCritical
Publication of JPS528419Y2publicationCriticalpatent/JPS528419Y2/ja