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经营范围
发明名称
Drill bit
摘要
申请公布号
US3080934(A)
申请公布日期
1963.03.12
申请号
US19590841062
申请日期
1959.09.21
申请人
BERSCHEID IRVINE J
发明人
BERSCHEID IRVINE J.
分类号
E21B10/58
主分类号
E21B10/58
代理机构
代理人
主权项
地址
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