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Priority to JP11079790UpriorityCriticalpatent/JPH0466402U/ja
Priority to US07/779,788prioritypatent/US5215124A/en
Priority to CA002054000Aprioritypatent/CA2054000C/en
Priority to EP91309807Aprioritypatent/EP0482916A1/en
Publication of JPH0466402UpublicationCriticalpatent/JPH0466402U/ja