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Priority to JP1976088638UpriorityCriticalpatent/JPS5611897Y2/ja
Priority to US05/807,966prioritypatent/US4111503A/en
Publication of JPS537254UpublicationCriticalpatent/JPS537254U/ja
Application grantedgrantedCritical
Publication of JPS5611897Y2publicationCriticalpatent/JPS5611897Y2/ja