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发明名称
ROOF SUPPORTING SYSTEM FOR MINE WORKINGS AND METHOD OF SUPPORTING ROOFS OF MINE WORKINGS
摘要
申请公布号
PL295674(A1)
申请公布日期
1993.03.22
申请号
PL19920295674
申请日期
1992.08.20
申请人
DYCKERHOFF & WIDMANN AG
发明人
LONG LAWRENCE E
分类号
E21D11/00;F16B7/06;(IPC1-7):E21D21/00
主分类号
E21D11/00
代理机构
代理人
主权项
地址
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