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发明名称
Roof supports for mine workings
摘要
申请公布号
US2861429(A)
申请公布日期
1958.11.25
申请号
US19560629685
申请日期
1956.12.20
申请人
THE MINING ENGINEERING COMPANY LIMITED
发明人
DUNCAN ANGUS WELLESLEY
分类号
E21D23/00
主分类号
E21D23/00
代理机构
代理人
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地址
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