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发明名称
IMPROVEMENTS IN OR RELATING TO UNDERGROUND MINING SYSTEMS
摘要
申请公布号
GB9111267(D0)
申请公布日期
1991.07.17
申请号
GB19910011267
申请日期
1991.05.24
申请人
COAL INDUSTRY (PATENTS) LIMITED
发明人
分类号
E21F1/14
主分类号
E21F1/14
代理机构
代理人
主权项
地址
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