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发明名称
WELL-DRILLING TOOLS
摘要
申请公布号
GB9211168(D0)
申请公布日期
1992.07.08
申请号
GB19920011168
申请日期
1992.05.27
申请人
ASTEC DEVELOPMENTS LIMITED
发明人
分类号
主分类号
代理机构
代理人
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