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发明名称
Traverse métallique pour étaiements, notamment pour effondreurs de mines
摘要
申请公布号
FR840914(A)
申请公布日期
1939.05.08
申请号
FRD840914
申请日期
1938.01.05
申请人
MINES DOMANIALES DE POTASSE D'ALSACE
发明人
BORREL PIERRE RENE
分类号
E21D15/48
主分类号
E21D15/48
代理机构
代理人
主权项
地址
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