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发明名称
Improvements in or relating to manhole covers
摘要
申请公布号
GB559055(A)
申请公布日期
1944.02.02
申请号
GB19420008465
申请日期
1942.06.19
申请人
BROAD & COMPANY LIMITED;DONALD GEORGE HARRIS
发明人
分类号
E02D29/14
主分类号
E02D29/14
代理机构
代理人
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