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摘要
申请公布号
GB1238369(A)
申请公布日期
1971.07.07
申请号
GBD1238369
申请日期
1968.11.13
申请人
发明人
分类号
E21B10/10;E21B10/12;E21B10/20;E21B10/28;E21D9/10;E21D9/11;E21D9/12
主分类号
E21B10/10
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