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发明名称
Improvements relating to Roof Supports for Mine Wokings
摘要
申请公布号
GB1198507(A)
申请公布日期
1970.07.15
申请号
GB19670051724
申请日期
1967.11.14
申请人
KARL MARIA GROETSCHEL
发明人
KARL MARIA GROETSCHEL
分类号
E21D23/00;E21D23/04
主分类号
E21D23/00
代理机构
代理人
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