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Priority to JP1980168020UpriorityCriticalpatent/JPS631295Y2/ja
Priority to US06/321,526prioritypatent/US4392730A/en
Publication of JPS5790431UpublicationCriticalpatent/JPS5790431U/ja
Application grantedgrantedCritical
Publication of JPS631295Y2publicationCriticalpatent/JPS631295Y2/ja