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Priority to JP6920885UpriorityCriticalpatent/JPH028580Y2/ja
Priority to US06/817,051prioritypatent/US4651866A/en
Priority to CA000499269Aprioritypatent/CA1251412A/en
Publication of JPS61185526UpublicationCriticalpatent/JPS61185526U/ja
Application grantedgrantedCritical
Publication of JPH028580Y2publicationCriticalpatent/JPH028580Y2/ja