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发明名称
DRILL TUBE
摘要
申请公布号
GB2240939(B)
申请公布日期
1993.06.30
申请号
GB19900023561
申请日期
1990.10.30
申请人
* INDUSTRIAL ALLOY COMPANY PTE. LTD.
发明人
BRUCE GRAHAM * CHAPMAN
分类号
E21B17/00
主分类号
E21B17/00
代理机构
代理人
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地址
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