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经营范围
发明名称
Manhole covers and frames
摘要
申请公布号
US2877696(A)
申请公布日期
1959.03.17
申请号
US19530360429
申请日期
1953.06.09
申请人
THE DOVER ENGINEERING WORKS LIMITED
发明人
ELKINGTON VIVIAN
分类号
E02D29/14
主分类号
E02D29/14
代理机构
代理人
主权项
地址
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