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发明名称
Sewer for sand
摘要
申请公布号
US1943188(A)
申请公布日期
1934.01.09
申请号
US19320608970
申请日期
1932.05.03
申请人
RICHARDS GEORGE W
发明人
RICHARDS GEORGE W.
分类号
E01F5/00
主分类号
E01F5/00
代理机构
代理人
主权项
地址
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