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Priority to JP1976077055UpriorityCriticalpatent/JPS553750Y2/ja
Priority to US05/790,695prioritypatent/US4169516A/en
Publication of JPS52169331UpublicationCriticalpatent/JPS52169331U/ja
Application grantedgrantedCritical
Publication of JPS553750Y2publicationCriticalpatent/JPS553750Y2/ja