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Priority to JP1987058113UpriorityCriticalpatent/JPH0619391Y2/ja
Priority to CA000563569Aprioritypatent/CA1294559C/en
Priority to US07/183,700prioritypatent/US4887686A/en
Publication of JPS63164030UpublicationCriticalpatent/JPS63164030U/ja
Application grantedgrantedCritical
Publication of JPH0619391Y2publicationCriticalpatent/JPH0619391Y2/ja