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发明名称
Railway crossing
摘要
申请公布号
US1908677(A)
申请公布日期
1933.05.16
申请号
US19310544406
申请日期
1931.06.15
申请人
BLAIR GROVER F
发明人
BLAIR GROVER F.
分类号
E01B7/30
主分类号
E01B7/30
代理机构
代理人
主权项
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