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发明名称
DIRECT DRIVE FOR DEEP BORING CUTTERS OR SIMILAR TOOLS OPERABLE IN A BORE HOLE
摘要
申请公布号
GB2047778(B)
申请公布日期
1982.12.22
申请号
GB19800013782
申请日期
1980.04.25
申请人
CHRISTENSEN INC
发明人
分类号
E21B4/02;E21B17/07;E21B31/00;(IPC1-7):E21B4/02
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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