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发明名称
FILLING DAM FOR MECHANICAL HOUSING
摘要
申请公布号
PL137846(B2)
申请公布日期
1986.07.31
申请号
PL19840248951
申请日期
1984.07.25
申请人
发明人
分类号
E21D23/00;E21F;E21F15/02;(IPC1-7):E21F15/02
主分类号
E21D23/00
代理机构
代理人
主权项
地址
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