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Priority to JP48381UpriorityCriticalpatent/JPS6238659Y2/ja
Priority to EP81110008Aprioritypatent/EP0060934A1/en
Priority to CA000393371Aprioritypatent/CA1170937A/en
Priority to US06/336,992prioritypatent/US4458675A/en
Publication of JPS57113135UpublicationCriticalpatent/JPS57113135U/ja
Application grantedgrantedCritical
Publication of JPS6238659Y2publicationCriticalpatent/JPS6238659Y2/ja