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发明名称
Drilling bit
摘要
申请公布号
GB1023419(A)
申请公布日期
1966.03.23
申请号
GB19640046607
申请日期
1964.11.16
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V.
发明人
FEENSTRA ROBIJIN
分类号
E21B10/18
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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