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经营范围
发明名称
Ringfoermiger Ausbau von Grubenstrecken, Tunneln und aehnlichen Bauwerken
摘要
申请公布号
DE681572(C)
申请公布日期
1939.09.26
申请号
DE1935SC08328D
申请日期
1935.10.29
申请人
EMIL SCHMIDTMANN
发明人
分类号
E21D11/20
主分类号
E21D11/20
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