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Priority to JP1981078007UpriorityCriticalpatent/JPS6232321Y2/ja
Priority to US06/379,957prioritypatent/US4460991A/en
Publication of JPS57191908UpublicationCriticalpatent/JPS57191908U/ja
Application grantedgrantedCritical
Publication of JPS6232321Y2publicationCriticalpatent/JPS6232321Y2/ja