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Priority to JP16959679UpriorityCriticalpatent/JPH0132220Y2/ja
Priority to EP80107584Aprioritypatent/EP0030367A1/en
Priority to US06/213,112prioritypatent/US4368860A/en
Priority to CA000366228Aprioritypatent/CA1148654A/en
Publication of JPS5686680UpublicationCriticalpatent/JPS5686680U/ja
Application grantedgrantedCritical
Publication of JPH0132220Y2publicationCriticalpatent/JPH0132220Y2/ja