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发明名称
Under-reamers
摘要
申请公布号
US2868510(A)
申请公布日期
1959.01.13
申请号
US19550556586
申请日期
1955.12.30
申请人
DEAN CHARLES A
发明人
DEAN CHARLES A.
分类号
E21B10/34
主分类号
E21B10/34
代理机构
代理人
主权项
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