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Priority to JP1987116828UpriorityCriticalpatent/JPH0440517Y2/ja
Priority to US07/224,652prioritypatent/US4913494A/en
Publication of JPS6421641UpublicationCriticalpatent/JPS6421641U/ja
Application grantedgrantedCritical
Publication of JPH0440517Y2publicationCriticalpatent/JPH0440517Y2/ja
