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发明名称
Advancing roof-supporting device
摘要
申请公布号
GB957071(A)
申请公布日期
1964.05.06
申请号
GB19610004204
申请日期
1961.02.03
申请人
DOWTY MINING EQUIPMENT LIMITED
发明人
BARRETT WESLEY HORACE;FARR PETER;CANNON DENNIS HENRY
分类号
E21D23/00;E21D23/04
主分类号
E21D23/00
代理机构
代理人
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