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发明名称
MINE SHAFT CASING ESPECIALLY FOR SHAFTS BEING DRIVEN THROUGH WATERED FORMATIONS
摘要
申请公布号
PL111888(B1)
申请公布日期
1980.09.30
申请号
PL19750185416
申请日期
1975.12.10
申请人
发明人
分类号
E21D5/04;(IPC1-7):E21D5/04
主分类号
E21D5/04
代理机构
代理人
主权项
地址
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