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经营范围
发明名称
Rotary drill bit
摘要
申请公布号
US1882545(A)
申请公布日期
1932.10.11
申请号
US19290416807
申请日期
1929.12.27
申请人
FAY OLIVER;DOROTHEA C. BRIGHAM
发明人
BRIGHAM LAWRENCE MADISON
分类号
E21B10/08
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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