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经营范围
发明名称
Ring- oder bogenfoermiger Ausbau fuer Grubenstrecken und Tunnel
摘要
申请公布号
DE921561(C)
申请公布日期
1954.12.20
申请号
DE1950B008219
申请日期
1950.07.16
申请人
BOCHUMER EISENHUETTE HEINTZMANN & CO.
发明人
分类号
E21D11/22
主分类号
E21D11/22
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