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发明名称
Method of driving tunnels in solid rock
摘要
申请公布号
AT395263(B)
申请公布日期
1992.11.10
申请号
AT19890000142
申请日期
1989.01.25
申请人
FRIEDMANN WALTER DIPL.ING.
发明人
分类号
E21C41/16;E21D9/00;E21D20/00
主分类号
E21C41/16
代理机构
代理人
主权项
地址
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