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发明名称
PLUGGING DEVICE
摘要
申请公布号
SU1218074(A1)
申请公布日期
1986.03.15
申请号
SU19843713716
申请日期
1984.03.23
申请人
VNI GEOLOGO-RAZVEDOCHNYJ I UGOLNYKH MESTOROZHDENIJ
发明人
LOBANOV BORIS S,SU
分类号
E21B27/02;E21B33/14;(IPC1-7):E21B33/14
主分类号
E21B27/02
代理机构
代理人
主权项
地址
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