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Priority to JP1981022923UpriorityCriticalpatent/JPH0138601Y2/ja
Priority to GB8131978Aprioritypatent/GB2088253B/en
Priority to US06/315,734prioritypatent/US4406535A/en
Priority to DE3143397Aprioritypatent/DE3143397C2/de
Publication of JPS57136952UpublicationCriticalpatent/JPS57136952U/ja
Application grantedgrantedCritical
Publication of JPH0138601Y2publicationCriticalpatent/JPH0138601Y2/ja