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Priority to JP4683481UpriorityCriticalpatent/JPS57161075U/ja
Priority to GB8131660Aprioritypatent/GB2088602B/en
Priority to US06/313,271prioritypatent/US4531050A/en
Priority to KR1019810004035Aprioritypatent/KR830008322A/ko
Publication of JPS57161075UpublicationCriticalpatent/JPS57161075U/ja
Priority to KR2019850015560Uprioritypatent/KR850003352Y1/ko