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经营范围
发明名称
Perfectionnements aux dispositifs de soutènement pour l'exploitation des mines, notamment aux rallongues, chapeaux et similaires, pour le soutènement des tailles
摘要
申请公布号
FR990387(A)
申请公布日期
1951.09.20
申请号
FRD990387
申请日期
1949.07.07
申请人
发明人
GROETSCHEL KARL MARIA
分类号
E21D17/086
主分类号
E21D17/086
代理机构
代理人
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