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Priority to JP1975121996UpriorityCriticalpatent/JPS5235138U/ja
Priority to GB25403/76Aprioritypatent/GB1549262A/en
Priority to DE2627968Aprioritypatent/DE2627968C2/de
Priority to SE7607262Aprioritypatent/SE428525B/xx
Publication of JPS5235138UpublicationCriticalpatent/JPS5235138U/ja