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经营范围
发明名称
Railway crossing
摘要
申请公布号
US1793779(A)
申请公布日期
1931.02.24
申请号
US19300444181
申请日期
1930.04.14
申请人
DAILEY JOHN A;GERTH LEWIS W
发明人
DAILEY JOHN A.;GERTH LEWIS W.
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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