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经营范围
发明名称
Well drilling bit
摘要
申请公布号
US1854624(A)
申请公布日期
1932.04.19
申请号
US19300442154
申请日期
1930.04.07
申请人
POWELL ALFRED F
发明人
POWELL ALFRED F.
分类号
E21B4/00;E21B10/08;E21B10/18;E21B10/20;E21B10/22
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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