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经营范围
发明名称
Highway-crossing signal
摘要
申请公布号
US1788182(A)
申请公布日期
1931.01.06
申请号
US19280301214
申请日期
1928.08.22
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
ZIERDT CONRAD H.
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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