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Priority to JP2725676UpriorityCriticalpatent/JPS52120697U/ja
Priority to US05/771,663prioritypatent/US4121488A/en
Priority to GB9419/77Aprioritypatent/GB1535008A/en
Priority to DE19772710076prioritypatent/DE2710076A1/de
Publication of JPS52120697UpublicationCriticalpatent/JPS52120697U/ja