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经营范围
发明名称
Improvements in pit or mine passage supports
摘要
申请公布号
GB482429(A)
申请公布日期
1938.03.29
申请号
GB19370027066
申请日期
1937.10.06
申请人
HEINRICH ISSELHORST
发明人
分类号
E21D11/18
主分类号
E21D11/18
代理机构
代理人
主权项
地址
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