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发明名称
Передвижная металлическая крепь для крутопадающих пластов
摘要
申请公布号
SU112972(A1)
申请公布日期
1957.11.30
申请号
SU19500435199
申请日期
1950.09.26
申请人
GRIDIN A.L.
发明人
GRIDIN A.L.
分类号
E21D23/04;E21D23/08
主分类号
E21D23/04
代理机构
代理人
主权项
地址
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