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经营范围
发明名称
Automatic railway crossing gate
摘要
申请公布号
US1899496(A)
申请公布日期
1933.02.28
申请号
US19320586863
申请日期
1932.01.15
申请人
DAY CHARLES T
发明人
DAY CHARLES T.
分类号
B61L29/22
主分类号
B61L29/22
代理机构
代理人
主权项
地址
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