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发明名称
Improvements in and relating to percussive drill bits
摘要
申请公布号
GB793250(A)
申请公布日期
1958.04.16
申请号
GB19540036998
申请日期
1954.12.22
申请人
ERNEST GRIFFITHS;JOHN ROGERS
发明人
分类号
E21B10/36
主分类号
E21B10/36
代理机构
代理人
主权项
地址
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