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发明名称
DRILLING EQUIPMENT
摘要
申请公布号
GB8611018(D0)
申请公布日期
1986.06.11
申请号
GB19860011018
申请日期
1986.05.06
申请人
LIPSKER, Y
发明人
分类号
E21B4/18;E21B7/00;E21B17/04;(IPC1-7):E21B/
主分类号
E21B4/18
代理机构
代理人
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地址
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