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经营范围
发明名称
Improvements in rotary drag bits
摘要
申请公布号
GB950305(A)
申请公布日期
1964.02.26
申请号
GB19620006917
申请日期
1962.02.22
申请人
JERSEY PRODUCTION RESEARCH COMPANY
发明人
分类号
E21B10/54
主分类号
E21B10/54
代理机构
代理人
主权项
地址
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