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发明名称
Roof supports suitable for use in mines
摘要
申请公布号
US3381480(A)
申请公布日期
1968.05.07
申请号
US19650430922
申请日期
1965.02.08
申请人
DOWTY MINING EQUIPMENT LIMITED
发明人
ANDREWS THOMAS D. H.
分类号
E21D23/00;E21D23/04
主分类号
E21D23/00
代理机构
代理人
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地址
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