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发明名称
Yieldable mine rook support
摘要
申请公布号
GB9826808(D0)
申请公布日期
1999.01.27
申请号
GB19980026808
申请日期
1998.01.22
申请人
JACK KENNEDY METAL PRODUCTS AND BUILDINGS INC
发明人
分类号
E21D15/18
主分类号
E21D15/18
代理机构
代理人
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