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发明名称
METHOD OF PROTECTING A MINE WORKING
摘要
申请公布号
SU1461976(A1)
申请公布日期
1989.02.28
申请号
SU19864170754
申请日期
1986.12.30
申请人
DN GORNYJ I IM.ARTEMA
发明人
PONOMARENKO PAVEL I,SU;GRETSINGER ALEKSANDR B,SU;PONOMARENKO ELENA P,SU;IVASHCHENKO NATALIYA G,SU
分类号
E21D13/02
主分类号
E21D13/02
代理机构
代理人
主权项
地址
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