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Priority to JP6145080UpriorityCriticalpatent/JPS6332362Y2/ja
Priority to US06/258,513prioritypatent/US4403371A/en
Priority to CA000376977Aprioritypatent/CA1176411A/en
Publication of JPS56167774UpublicationCriticalpatent/JPS56167774U/ja
Application grantedgrantedCritical
Publication of JPS6332362Y2publicationCriticalpatent/JPS6332362Y2/ja