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发明名称
Under-reamer with pivoting and sliding arms
摘要
申请公布号
GB2430949(A)
申请公布日期
2007.04.11
申请号
GB20050020582
申请日期
2005.10.10
申请人
BALFOUR BEATTY PLC
发明人
ALEX CARTWRIGHT
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
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地址
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