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Priority to JP1981056977UpriorityCriticalpatent/JPS628420Y2/ja
Priority to US06/294,764prioritypatent/US4426119A/en
Priority to DE19813138996prioritypatent/DE3138996A1/de
Publication of JPS57169823UpublicationCriticalpatent/JPS57169823U/ja
Application grantedgrantedCritical
Publication of JPS628420Y2publicationCriticalpatent/JPS628420Y2/ja