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发明名称
UN PROCEDIMIENTO PARA FORMAR FRACTURAS LINEALES VERTICALES EN UNA FORMACION PRODUCTORA DE UN SUBTERRANEO
摘要
申请公布号
ES490750(D0)
申请公布日期
1981.04.16
申请号
ES19500004907
申请日期
1980.04.21
申请人
PERLMAN WILLIAM
发明人
分类号
E21B43/25;(IPC1-7):21B43/25
主分类号
E21B43/25
代理机构
代理人
主权项
地址
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