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Priority to JP1981053550UpriorityCriticalpatent/JPS6117977Y2/ja
Priority to CA000393062Aprioritypatent/CA1169390A/en
Priority to DE19813151803prioritypatent/DE3151803A1/de
Publication of JPS57170879UpublicationCriticalpatent/JPS57170879U/ja
Priority to US06/735,718prioritypatent/US4869367A/en
Application grantedgrantedCritical
Publication of JPS6117977Y2publicationCriticalpatent/JPS6117977Y2/ja