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发明名称
Manhole structure
摘要
申请公布号
US2163221(A)
申请公布日期
1939.06.20
申请号
US19370181708
申请日期
1937.12.24
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
SLOCUM HARVEY FRANCIS
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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