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经营范围
发明名称
DRAG BIT AND CUTTERS
摘要
申请公布号
GB8404466(D0)
申请公布日期
1984.03.28
申请号
GB19840004466
申请日期
1984.02.21
申请人
NL INDUSTRIES INC
发明人
分类号
E21B10/56;E21B10/567;(IPC1-7):E21B/
主分类号
E21B10/56
代理机构
代理人
主权项
地址
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