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发明名称
摘要
申请公布号
GB1250146(A)
申请公布日期
1971.10.20
申请号
GBD1250146
申请日期
1970.02.26
申请人
发明人
分类号
E21B10/56;E21B10/62
主分类号
E21B10/56
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