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发明名称
APPARATUS FOR CHANGING DIRECTION OF ENCASED BOREHOLE
摘要
申请公布号
PL150480(B1)
申请公布日期
1990.05.31
申请号
PL19860257881
申请日期
1986.02.10
申请人
发明人
分类号
E21B;E21B7/08;E21B47/02;(IPC1-7):E21B7/08
主分类号
E21B
代理机构
代理人
主权项
地址
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