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Priority to JP1975162343UpriorityCriticalpatent/JPS599350Y2/ja
Priority to US05/690,923prioritypatent/US4030632A/en
Publication of JPS5274200UpublicationCriticalpatent/JPS5274200U/ja
Application grantedgrantedCritical
Publication of JPS599350Y2publicationCriticalpatent/JPS599350Y2/ja