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经营范围
发明名称
Seal protection for rock bits
摘要
申请公布号
GB2283037(B)
申请公布日期
1996.10.09
申请号
GB19940020987
申请日期
1994.10.18
申请人
* SMITH INTERNATIONAL INC
发明人
QUAN VAN * NGUYEN
分类号
E21B10/22;E21B10/25;(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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