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发明名称
DEVICE FOR PROTECTION OF WORKING EXCAVATION
摘要
申请公布号
SU1686178(A1)
申请公布日期
1991.10.23
申请号
SU19894710691
申请日期
1989.06.26
申请人
NI PK I PO DOBYCHE POLEZNYKH ISKOPAEMYKH OTKRYTYM SPOSOBOM
发明人
STARODUMOV NIKOLAJ A,SU;RYLEEV VALERIJ S,SU
分类号
E21D23/04
主分类号
E21D23/04
代理机构
代理人
主权项
地址
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