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摘要
申请公布号
SU454330(A2)
申请公布日期
1974.12.25
申请号
SU19721749762
申请日期
1972.02.18
申请人
发明人
分类号
E21B15/00;(IPC1-7):E21B15/00;E02D17/14
主分类号
E21B15/00
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