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Priority to JP1989087886UpriorityCriticalpatent/JPH055659Y2/ja
Priority to CA002018400Aprioritypatent/CA2018400C/en
Priority to GB9012654Aprioritypatent/GB2233170B/en
Priority to US07/534,640prioritypatent/US5044967A/en
Publication of JPH0326981UpublicationCriticalpatent/JPH0326981U/ja
Application grantedgrantedCritical
Publication of JPH055659Y2publicationCriticalpatent/JPH055659Y2/ja