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经营范围
发明名称
Perfectionnements apportés aux ventilateurs de mines
摘要
申请公布号
FR732607(A)
申请公布日期
1932.09.23
申请号
FRD732607
申请日期
1932.03.03
申请人
WERKSPOOR N. V.
发明人
分类号
E21F1/00
主分类号
E21F1/00
代理机构
代理人
主权项
地址
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