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Priority to JP1987145537UpriorityCriticalpatent/JPH048032Y2/ja
Priority to US07/247,777prioritypatent/US4916589A/en
Publication of JPS6449442UpublicationCriticalpatent/JPS6449442U/ja
Application grantedgrantedCritical
Publication of JPH048032Y2publicationCriticalpatent/JPH048032Y2/ja
