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经营范围
发明名称
Improvements in rotary well bits
摘要
申请公布号
GB1088814(A)
申请公布日期
1967.10.25
申请号
GB19660007598
申请日期
1966.02.21
申请人
SETH RAYMOND KNAPP
发明人
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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