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发明名称
Highway railroad crossing
摘要
申请公布号
US1932895(A)
申请公布日期
1933.10.31
申请号
US19320618037
申请日期
1932.06.18
申请人
ALBERT HUMPHRIES
发明人
HUMPHRIES ALBERT
分类号
E01C9/04
主分类号
E01C9/04
代理机构
代理人
主权项
地址
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