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Priority to JP7800681UpriorityCriticalpatent/JPS6138081Y2/ja
Priority to US06/379,957prioritypatent/US4460991A/en
Publication of JPS57191907UpublicationCriticalpatent/JPS57191907U/ja
Application grantedgrantedCritical
Publication of JPS6138081Y2publicationCriticalpatent/JPS6138081Y2/ja