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Priority to JP7220781UpriorityCriticalpatent/JPS6131580Y2/ja
Priority to US06/377,908prioritypatent/US4436173A/en
Publication of JPS57184359UpublicationCriticalpatent/JPS57184359U/ja
Application grantedgrantedCritical
Publication of JPS6131580Y2publicationCriticalpatent/JPS6131580Y2/ja