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Priority to JP1970126317UpriorityCriticalpatent/JPS4934805Y1/ja
Priority to US00208864Aprioritypatent/US3788648A/en
Publication of JPS4934805Y1publicationCriticalpatent/JPS4934805Y1/ja
Magneto-optical disk apparatus including two magnetic field applying devices, one of which has a substantial ring-shaped core member with a gap in a portion thereof