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Priority to JP1986105198UpriorityCriticalpatent/JPH0711384Y2/ja
Priority to CA000535945Aprioritypatent/CA1295630C/en
Publication of JPS6312113UpublicationCriticalpatent/JPS6312113U/ja
Priority to US07/296,860prioritypatent/US4924044A/en
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Publication of JPH0711384Y2publicationCriticalpatent/JPH0711384Y2/ja