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Priority to JP7601076UpriorityCriticalpatent/JPS52166806U/ja
Priority to AU26001/77Aprioritypatent/AU2600177A/en
Priority to DE19772726348prioritypatent/DE2726348A1/de
Priority to GB2431577Aprioritypatent/GB1540942A/en
Publication of JPS52166806UpublicationCriticalpatent/JPS52166806U/ja