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Priority to JP12416378UpriorityCriticalpatent/JPS5540391U/ja
Priority to DE19792920808prioritypatent/DE2920808C2/de
Priority to CH489079Aprioritypatent/CH641566A5/de
Priority to GB7918462Aprioritypatent/GB2025622B/en
Publication of JPS5540391UpublicationCriticalpatent/JPS5540391U/ja