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Priority to JP18458382UpriorityCriticalpatent/JPS5988305U/ja
Priority to US06/556,541prioritypatent/US4570968A/en
Publication of JPS5988305UpublicationCriticalpatent/JPS5988305U/ja
Application grantedgrantedCritical
Publication of JPS621761Y2publicationCriticalpatent/JPS621761Y2/ja