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摘要
申请公布号
CS155919(B1)
申请公布日期
1974.06.24
申请号
CS19710007018
申请日期
1971.10.05
申请人
发明人
分类号
E21B43/26;(IPC1-7):E21B43/22
主分类号
E21B43/26
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