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发明名称
Longwall mining roof control system
摘要
申请公布号
GB9419701(D0)
申请公布日期
1994.11.16
申请号
GB19940019701
申请日期
1994.09.30
申请人
JENNMAR CORPORATION
发明人
分类号
E21C41/16;E21D11/00;E21D20/00
主分类号
E21C41/16
代理机构
代理人
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地址
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