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Priority to JP1981027825UpriorityCriticalpatent/JPS6318035Y2/ja
Priority to US06/256,257prioritypatent/US4403216A/en
Priority to GB8112682Aprioritypatent/GB2089549B/en
Priority to DE3117288Aprioritypatent/DE3117288C2/de
Publication of JPS57142775UpublicationCriticalpatent/JPS57142775U/ja
Priority to US06/490,725prioritypatent/US4568080A/en
Application grantedgrantedCritical
Publication of JPS6318035Y2publicationCriticalpatent/JPS6318035Y2/ja