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Priority to JP2670983UpriorityCriticalpatent/JPS59132472U/ja
Priority to US06/578,287prioritypatent/US4580831A/en
Publication of JPS59132472UpublicationCriticalpatent/JPS59132472U/ja
Application grantedgrantedCritical
Publication of JPS6237817Y2publicationCriticalpatent/JPS6237817Y2/ja