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Priority to JP16366976UpriorityCriticalpatent/JPS5380437U/ja
Priority to GB1350177Aprioritypatent/GB1565860A/en
Priority to DE19772714709prioritypatent/DE2714709C3/de
Priority to NL7703582Aprioritypatent/NL176992C/xx
Publication of JPS5380437UpublicationCriticalpatent/JPS5380437U/ja