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Priority to JP18562185UpriorityCriticalpatent/JPH0352236Y2/ja
Priority to US06/890,583prioritypatent/US4721630A/en
Priority to CA000514950Aprioritypatent/CA1263015A/en
Priority to GB8618718Aprioritypatent/GB2180173B/en
Publication of JPS6292990UpublicationCriticalpatent/JPS6292990U/ja
Application grantedgrantedCritical
Publication of JPH0352236Y2publicationCriticalpatent/JPH0352236Y2/ja