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发明名称
DRILLING ROD
摘要
申请公布号
SU898036(A1)
申请公布日期
1982.01.15
申请号
SU19802880272
申请日期
1980.02.08
申请人
DO NI UGOLNYJ INSTITUT
发明人
SILCHENKO PETR T,SU;ALEJNIKOV ALEKSANDR A,SU;PETRAKOV IVAN A,SU
分类号
E21B17/00;E21B17/046;(IPC1-7):E21B17/00;E21B17/04
主分类号
E21B17/00
代理机构
代理人
主权项
地址
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