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经营范围
发明名称
Signal for railway crossings
摘要
申请公布号
US1951195(A)
申请公布日期
1934.03.13
申请号
US19310569441
申请日期
1931.10.17
申请人
OSCAR MARCOTTE
发明人
MARCOTTE OSCAR
分类号
B61L29/28
主分类号
B61L29/28
代理机构
代理人
主权项
地址
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