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经营范围
发明名称
Cadre de soutènement métallique télescopique pour galeries de mines
摘要
申请公布号
FR818795(A)
申请公布日期
1937.10.04
申请号
FRD818795
申请日期
1937.03.08
申请人
发明人
NIELS LEOPOLD
分类号
E21D11/22
主分类号
E21D11/22
代理机构
代理人
主权项
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