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发明名称
Procédé pour assurer la sécurité du toit d'une exploitation souterraine
摘要
申请公布号
FR944001(A)
申请公布日期
1949.03.24
申请号
FRD944001
申请日期
1947.03.27
申请人
发明人
BEIJL ZAKO SYTSE
分类号
E21D11/00
主分类号
E21D11/00
代理机构
代理人
主权项
地址
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