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Priority to JP2168877UpriorityCriticalpatent/JPS53117215U/ja
Priority to US05/840,278prioritypatent/US4128853A/en
Priority to DE19772747026prioritypatent/DE2747026A1/de
Priority to GB43743/77Aprioritypatent/GB1585902A/en
Publication of JPS53117215UpublicationCriticalpatent/JPS53117215U/ja