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Priority to JP1988098643UpriorityCriticalpatent/JP2504772Y2/ja
Priority to US07/384,951prioritypatent/US4962314A/en
Priority to CA000606603Aprioritypatent/CA1319857C/en
Publication of JPH0219148UpublicationCriticalpatent/JPH0219148U/ja
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Publication of JP2504772Y2publicationCriticalpatent/JP2504772Y2/ja