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Priority to JP8908576UpriorityCriticalpatent/JPS537120U/ja
Priority to GB1762777Aprioritypatent/GB1534814A/en
Priority to DE19772724061prioritypatent/DE2724061A1/de
Priority to FR7719174Aprioritypatent/FR2358017A1/fr
Publication of JPS537120UpublicationCriticalpatent/JPS537120U/ja