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GB 11386һ89
ISO 7901-1984
Information processing-Unrecorded,hard-sectored,
130 mm flexible disk cartridges, one or two-sided use-Dimensional
physical and magnetic characteristics
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GBT 11386-1989 信息处理 130mm未记录的硬扇段单面或双面软磁盘 尺寸、物理性能和磁性能.pdf