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Priority to JP4057476UpriorityCriticalpatent/JPS5615986Y2/ja
Priority to US05/776,852prioritypatent/US4139973A/en
Priority to GB11402/77Aprioritypatent/GB1573936A/en
Publication of JPS52131856UpublicationCriticalpatent/JPS52131856U/ja
Application grantedgrantedCritical
Publication of JPS5615986Y2publicationCriticalpatent/JPS5615986Y2/ja