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发明名称
摘要
申请公布号
GB1251577(A)
申请公布日期
1971.10.27
申请号
GBD1251577
申请日期
1969.10.01
申请人
发明人
分类号
G11B5/193;G11B5/31;G11B5/33
主分类号
G11B5/193
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