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Priority to JP8077674UpriorityCriticalpatent/JPS5331385Y2/ja
Priority to US05/590,288prioritypatent/US4019112A/en
Publication of JPS519222UpublicationCriticalpatent/JPS519222U/ja
Application grantedgrantedCritical
Publication of JPS5331385Y2publicationCriticalpatent/JPS5331385Y2/ja