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发明名称
Improvements relating to drill bits for drilling oil wells
摘要
申请公布号
GB444713(A)
申请公布日期
1936.03.25
申请号
GB19340035864
申请日期
1934.09.25
申请人
JOHN ADOLPHUS ZUBLIN
发明人
分类号
E21B10/08;E21B10/18;E21B10/20;E21B10/22
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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