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发明名称
BALL-JET TOOL FOR WELL-DRILLING
摘要
申请公布号
SU939710(A2)
申请公布日期
1982.06.30
申请号
SU19803009898
申请日期
1980.12.02
申请人
KOROTKOV VALENTIN P,SU
发明人
KOROTKOV VALENTIN P,SU
分类号
E21B7/18;(IPC1-7):E21B7/18
主分类号
E21B7/18
代理机构
代理人
主权项
地址
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