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发明名称
Fluid operated rotary drilling bit
摘要
申请公布号
US2154553(A)
申请公布日期
1939.04.18
申请号
US19380227277
申请日期
1938.08.29
申请人
ZUBLIN JOHN A
发明人
ZUBLIN JOHN A.
分类号
E21B10/08
主分类号
E21B10/08
代理机构
代理人
主权项
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