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发明名称
CULVERT OR SMALL BRIDGE AND METHOD OF MAKING THE SAME
摘要
申请公布号
PL124991(B1)
申请公布日期
1983.03.31
申请号
PL19790220998
申请日期
1979.12.29
申请人
发明人
分类号
E01D;E01D1/00;E01F5/00;(IPC1-7):E01F5/00
主分类号
E01D
代理机构
代理人
主权项
地址
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