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Priority to JP1979178216UpriorityCriticalpatent/JPS6213207Y2/ja
Publication of JPS5699617UpublicationCriticalpatent/JPS5699617U/ja
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Publication of JPS6213207Y2publicationCriticalpatent/JPS6213207Y2/ja
Rotary head drum apparatus including a rotary drum having a head and a switch for selecting the head and magnetic recording and/or reproducing apparatus using the same