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发明名称
Railroad crossing
摘要
申请公布号
US3087678(A)
申请公布日期
1963.04.30
申请号
US19600016805
申请日期
1960.03.22
申请人
UNITED STATES STEEL CORPORATION
发明人
DYCK HUBERT I.
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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