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经营范围
发明名称
A modulated bias unit for rotary drilling
摘要
申请公布号
GB9511081(D0)
申请公布日期
1995.07.26
申请号
GB19950011081
申请日期
1995.06.01
申请人
CAMCO DRILLING GROUP LIMITED
发明人
分类号
E21B4/00;E21B7/04;E21B7/06;E21B7/08;E21B17/10
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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