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发明名称
Mine roof support remote control systems
摘要
申请公布号
US3259024(A)
申请公布日期
1966.07.05
申请号
US19640348487
申请日期
1964.03.02
申请人
COAL INDUSTRY (PATENTS) LIMITED
发明人
KIBBLE JOHN DUNBAR;PENN RONALD GEORGE
分类号
E21D23/16
主分类号
E21D23/16
代理机构
代理人
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