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摘要
申请公布号
US2355430(A)
申请公布日期
1944.08.08
申请号
US19420427289
申请日期
1942.01.19
申请人
FLOOD WALTER H
发明人
FLOOD WALTER H.
分类号
E01F9/04
主分类号
E01F9/04
代理机构
代理人
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