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发明名称
LEMNISCATE TYPE ROOF SUPPORT
摘要
申请公布号
PL140157(B1)
申请公布日期
1987.03.31
申请号
PL19830244532
申请日期
1983.11.11
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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