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Priority to JP1976049550UpriorityCriticalpatent/JPS5639788Y2/ja
Priority to GB1617977Aprioritypatent/GB1580404A/en
Publication of JPS52140564UpublicationCriticalpatent/JPS52140564U/ja
Application grantedgrantedCritical
Publication of JPS5639788Y2publicationCriticalpatent/JPS5639788Y2/ja