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经营范围
发明名称
Drill bit
摘要
申请公布号
GB897832(A)
申请公布日期
1962.05.30
申请号
GB19590025215
申请日期
1959.07.22
申请人
SOCONY MOBIL OIL COMPANY, INC.
发明人
分类号
E21B10/46
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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