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Priority to JP1981007110UpriorityCriticalpatent/JPH026903Y2/ja
Priority to US06/331,330prioritypatent/US4426211A/en
Priority to GB8138197Aprioritypatent/GB2092472B/en
Priority to DE3150299Aprioritypatent/DE3150299C2/de
Publication of JPS57121247UpublicationCriticalpatent/JPS57121247U/ja
Application grantedgrantedCritical
Publication of JPH026903Y2publicationCriticalpatent/JPH026903Y2/ja