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发明名称
Improvements relating to roof supporting systems for mine workings
摘要
申请公布号
GB1091312(A)
申请公布日期
1967.11.15
申请号
GB19640051783
申请日期
1964.12.21
申请人
KARL MARIA GROETSCHEL
发明人
分类号
E21D23/00;E21D23/04
主分类号
E21D23/00
代理机构
代理人
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