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Priority to JP4591976UpriorityCriticalpatent/JPS52137885U/ja
Priority to US05/752,362prioritypatent/US4087957A/en
Priority to GB54124/76Aprioritypatent/GB1572513A/en
Priority to DE19762658782prioritypatent/DE2658782A1/de
Publication of JPS52137885UpublicationCriticalpatent/JPS52137885U/ja