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发明名称
LOCKING CONNECTION OF DRILLING RODS
摘要
申请公布号
SU1574786(A1)
申请公布日期
1990.06.30
申请号
SU19874271601
申请日期
1987.06.29
申请人
INST GORNOGO DELA IM.A.A.SKOCHINSKOGO
发明人
KOLYAGIN VIKTOR M,SU
分类号
E21B17/04;E21B17/02;E21B17/042
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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