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发明名称
Improvements in or relating to roof bars for use in underground mines
摘要
申请公布号
GB775180(A)
申请公布日期
1957.05.22
申请号
GB19540009598
申请日期
1954.04.01
申请人
COAL INDUSTRY (PATENTS) LIMITED
发明人
HANMAN JACK;BOOKER JACK
分类号
E21D17/086
主分类号
E21D17/086
代理机构
代理人
主权项
地址
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