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发明名称
Improvements relating to roof supports for mine workings
摘要
申请公布号
GB1069901(A)
申请公布日期
1967.05.24
申请号
GB19640020045
申请日期
1964.05.14
申请人
KARL MARIA GROETSCHEL
发明人
分类号
E21D15/58;E21D23/00
主分类号
E21D15/58
代理机构
代理人
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