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发明名称
SELF-LOCKING MANHOLE COVER
摘要
申请公布号
GB2181474(B)
申请公布日期
1988.08.03
申请号
GB19860022677
申请日期
1986.01.29
申请人
FURNES-HAMJERN NCC AS
发明人
JOHAN * REFSAHL
分类号
E02D29/14;(IPC1-7):E02D29/14
主分类号
E02D29/14
代理机构
代理人
主权项
地址
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