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发明名称
Under-reaming tool
摘要
申请公布号
US2743087(A)
申请公布日期
1956.04.24
申请号
US19520314550
申请日期
1952.10.13
申请人
LAYNE
发明人
LAYNE LESLIE A.;MUNDT LOUIS C.
分类号
E21B10/34
主分类号
E21B10/34
代理机构
代理人
主权项
地址
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