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Priority to JP1978105310UpriorityCriticalpatent/JPS6212309Y2/ja
Priority to US06/060,474prioritypatent/US4293842A/en
Publication of JPS5522641UpublicationCriticalpatent/JPS5522641U/ja
Application grantedgrantedCritical
Publication of JPS6212309Y2publicationCriticalpatent/JPS6212309Y2/ja