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Priority to JP13080678UpriorityCriticalpatent/JPS5552492U/ja
Priority to DE19792938126prioritypatent/DE2938126A1/de
Priority to IT7925929Aprioritypatent/IT1123285B/it
Priority to FR7923568Aprioritypatent/FR2436707A1/fr
Publication of JPS5552492UpublicationCriticalpatent/JPS5552492U/ja
Priority to US06/238,964prioritypatent/US4442732A/en
