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发明名称
Method and apparatus for mining selected earth strata materials from overburden supporting columns
摘要
申请公布号
GB760868(A)
申请公布日期
1956.11.07
申请号
GB19540023727
申请日期
1954.08.16
申请人
UNION CARBIDE AND CARBON CORPORATION
发明人
分类号
E21C25/68
主分类号
E21C25/68
代理机构
代理人
主权项
地址
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