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Priority to JP6636376UpriorityCriticalpatent/JPS52157865U/ja
Priority to US05/796,566prioritypatent/US4268913A/en
Priority to GB20856/77Aprioritypatent/GB1569022A/en
Priority to DE19772722598prioritypatent/DE2722598A1/de
Publication of JPS52157865UpublicationCriticalpatent/JPS52157865U/ja