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发明名称
TIME-DELAY BORING APPARATUS
摘要
申请公布号
JPH03119290(A)
申请公布日期
1991.05.21
申请号
JP19900234643
申请日期
1990.09.06
申请人
HALLIBURTON CO
发明人
KEBUIN AARU JIYOOJI
分类号
E21B43/117;E21B43/1185
主分类号
E21B43/117
代理机构
代理人
主权项
地址
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