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Priority to JP9715276UpriorityCriticalpatent/JPS5315049U/ja
Priority to US05/816,197prioritypatent/US4164778A/en
Priority to DE2732529Aprioritypatent/DE2732529C2/de
Priority to GB30246/77Aprioritypatent/GB1565748A/en
Publication of JPS5315049UpublicationCriticalpatent/JPS5315049U/ja