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经营范围
发明名称
Etançon métallique pour mines et exploitations analogues
摘要
申请公布号
FR973461(A)
申请公布日期
1951.02.12
申请号
FRD973461
申请日期
1948.10.13
申请人
发明人
SMAL GILLES
分类号
E21D15/28
主分类号
E21D15/28
代理机构
代理人
主权项
地址
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