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经营范围
发明名称
Manhole structure
摘要
申请公布号
US2291763(A)
申请公布日期
1942.08.04
申请号
US19390265670
申请日期
1939.04.03
申请人
SANDBERG WILLIAM A
发明人
SANDBERG WILLIAM A.
分类号
F16J15/48
主分类号
F16J15/48
代理机构
代理人
主权项
地址
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