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发明名称
Improvements in mine roof bars
摘要
申请公布号
GB1037734(A)
申请公布日期
1966.08.03
申请号
GB19610045530
申请日期
1961.12.19
申请人
COAL INDUSTRY (PATENTS) LIMITED
发明人
KIBBLE JOHN DUNBAR
分类号
E21D17/02;E21D17/05;E21D23/00
主分类号
E21D17/02
代理机构
代理人
主权项
地址
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