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经营范围
发明名称
PLUGGING DEVICE
摘要
申请公布号
SU1602974(A1)
申请公布日期
1990.10.30
申请号
SU19884378695
申请日期
1988.02.15
申请人
VNI GEOLOGORAZVEDOCHNYJ I UGOLNYKH MESTOROZHDENIJ
发明人
LOBANOV BORIS S,SU
分类号
E21B27/02
主分类号
E21B27/02
代理机构
代理人
主权项
地址
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