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Priority to JP1989002325UpriorityCriticalpatent/JPH0450720Y2/ja
Priority to CA000609539Aprioritypatent/CA1321756C/en
Publication of JPH0293900UpublicationCriticalpatent/JPH0293900U/ja
Priority to US07/670,465prioritypatent/US5123051A/en
Application grantedgrantedCritical
Publication of JPH0450720Y2publicationCriticalpatent/JPH0450720Y2/ja