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经营范围
发明名称
DRILL PIPE SAFETY JOINT
摘要
申请公布号
SU1663177(A1)
申请公布日期
1991.07.15
申请号
SU19894724214
申请日期
1989.07.26
申请人
VNI PK I GEOFIZ
发明人
RYAZANTSEV NIKOLAJ F,SU;BOGOMAZOV VLADIMIR N,SU;PODZOLKOV VASILIJ V,SU
分类号
E21B23/00;E21B17/06
主分类号
E21B23/00
代理机构
代理人
主权项
地址
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