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Priority to JP18103080UpriorityCriticalpatent/JPS638937Y2/ja
Priority to CA000389011Aprioritypatent/CA1174464A/en
Publication of JPS57103486UpublicationCriticalpatent/JPS57103486U/ja
Application grantedgrantedCritical
Publication of JPS638937Y2publicationCriticalpatent/JPS638937Y2/ja