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发明名称
METHOD OF PROVIDING FALSE TIMBERING FOR LONGWALL CROSS-CUTS
摘要
申请公布号
PL138093(B1)
申请公布日期
1986.08.30
申请号
PL19830240529
申请日期
1983.02.11
申请人
发明人
分类号
E21D;E21D19/00;(IPC1-7):E21D19/00
主分类号
E21D
代理机构
代理人
主权项
地址
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