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发明名称
Improvements relating to roof supports for mine workings
摘要
申请公布号
GB1037915(A)
申请公布日期
1966.08.03
申请号
GB19640020044
申请日期
1963.01.29
申请人
KARL MARIA GROETSCHEL
发明人
分类号
E21D23/00
主分类号
E21D23/00
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代理人
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