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发明名称
Assemblage de chapeaux pour soutènement des tailles au fond dans l'exploitation desmines
摘要
申请公布号
FR1033276(A)
申请公布日期
1953.07.09
申请号
FRD1033276
申请日期
1951.03.01
申请人
发明人
VANWERSCH ALOYS
分类号
E21D17/086
主分类号
E21D17/086
代理机构
代理人
主权项
地址
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