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发明名称
EARTH BORING BIT
摘要
申请公布号
GB2084631(A)
申请公布日期
1982.04.15
申请号
GB19810011543
申请日期
1981.04.13
申请人
HUGHES TOOL CO
发明人
分类号
E21B10/22;E21B10/23;E21B10/24;(IPC1-7):E21B10/22
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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