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Priority to JP47037897ApriorityCriticalpatent/JPS49580A/ja
Priority to US349771Aprioritypatent/US3918901A/en
Priority to DE2318762Aprioritypatent/DE2318762C3/de
Priority to GB1798973Aprioritypatent/GB1418199A/en
Priority to FR7313693Aprioritypatent/FR2180131B1/fr
Publication of JPS49580ApublicationCriticalpatent/JPS49580A/ja