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经营范围
发明名称
Roof supports
摘要
申请公布号
US2888231(A)
申请公布日期
1959.05.26
申请号
US19530355831
申请日期
1953.05.18
申请人
THE MINING ENGINEERING COMPANY LIMITED
发明人
DUNCAN ANGUS WELLESLEY
分类号
E21D15/58
主分类号
E21D15/58
代理机构
代理人
主权项
地址
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