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Priority to JP1977062420UpriorityCriticalpatent/JPS5712269Y2/ja
Priority to GB1913478Aprioritypatent/GB1598049A/en
Publication of JPS53157276UpublicationCriticalpatent/JPS53157276U/ja
Application grantedgrantedCritical
Publication of JPS5712269Y2publicationCriticalpatent/JPS5712269Y2/ja