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发明名称
SHIELD-TYPE MECHANIZED ROOF SUPPORTING STRUCTURE
摘要
申请公布号
PL115314(B1)
申请公布日期
1981.03.31
申请号
PL19780206059
申请日期
1978.04.12
申请人
发明人
分类号
E21D;E21D23/04;(IPC1-7):E21D23/04
主分类号
E21D
代理机构
代理人
主权项
地址
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