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经营范围
发明名称
Drill bits
摘要
申请公布号
US3042126(A)
申请公布日期
1962.07.03
申请号
US19610107531
申请日期
1961.05.03
申请人
CRAIG CLINTON W
发明人
CRAIG CLINTON W.
分类号
E21B10/26
主分类号
E21B10/26
代理机构
代理人
主权项
地址
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