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发明名称
Electric train signaling system
摘要
申请公布号
US1900412(A)
申请公布日期
1933.03.07
申请号
US19310578645
申请日期
1931.12.03
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
BOSSART PAUL N.
分类号
B61L3/22
主分类号
B61L3/22
代理机构
代理人
主权项
地址
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