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发明名称
Treibdorn mit kreisfoermigem Querschnitt zur Herstellung unterirdischer Kanaele
摘要
申请公布号
DE523546(C)
申请公布日期
1931.04.24
申请号
DENDATW083450D
申请日期
申请人
FERDINAND WILKENS
发明人
分类号
E02B11/02;E02F5/10
主分类号
E02B11/02
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