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发明名称
PREFABRICATED CONDUITS/TUBULAR RINGS
摘要
申请公布号
GB8715462(D0)
申请公布日期
1987.08.05
申请号
GB19870015462
申请日期
1987.07.01
申请人
ED ZUBLIN AG
发明人
分类号
E21B17/05;E21D9/00;E21D11/08;F16L1/036;F16L11/18
主分类号
E21B17/05
代理机构
代理人
主权项
地址
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