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发明名称
DIRECTIONAL DRILLING APPARATUS AND METHOD
摘要
申请公布号
GB8926109(D0)
申请公布日期
1990.01.10
申请号
GB19890026109
申请日期
1989.11.18
申请人
NOBLE, JAMES B
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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