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发明名称
Improvements relating to Roof Supports for Mine Workings.
摘要
申请公布号
GB1160513(A)
申请公布日期
1969.08.06
申请号
GB19660009472
申请日期
1966.03.04
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
主权项
地址
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