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发明名称
Manhole cover
摘要
申请公布号
US1751194(A)
申请公布日期
1930.03.18
申请号
US19280253885
申请日期
1928.02.13
申请人
NORMAN ELSY CHARLES
发明人
ELSY CHARLES NORMAN
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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