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发明名称
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摘要
申请公布号
US1825003(A)
申请公布日期
1931.09.29
申请号
US19300464046
申请日期
1930.06.26
申请人
LEDOUX JOSEPH A
发明人
LEDOUX JOSEPH A.
分类号
E01F9/07
主分类号
E01F9/07
代理机构
代理人
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