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Priority to JP2502576UpriorityCriticalpatent/JPS52116783U/ja
Priority to US05/773,198prioritypatent/US4110898A/en
Priority to CA272,883Aprioritypatent/CA1052083A/en
Priority to GB890777Aprioritypatent/GB1538409A/en
Publication of JPS52116783UpublicationCriticalpatent/JPS52116783U/ja