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发明名称
Improvements in or relating to the frames for supporting manhole covers
摘要
申请公布号
GB741328(A)
申请公布日期
1955.11.30
申请号
GB19530011570
申请日期
1953.04.27
申请人
VIVIAN ELKINGTON
发明人
分类号
E02D29/14
主分类号
E02D29/14
代理机构
代理人
主权项
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