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Priority to JP9108580UpriorityCriticalpatent/JPS636512Y2/ja
Priority to US06/267,424prioritypatent/US4432446A/en
Publication of JPS5712838UpublicationCriticalpatent/JPS5712838U/ja
Application grantedgrantedCritical
Publication of JPS636512Y2publicationCriticalpatent/JPS636512Y2/ja