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经营范围
发明名称
Railway traffic controlling system
摘要
申请公布号
US1983512(A)
申请公布日期
1934.12.04
申请号
US19320608501
申请日期
1932.04.30
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
JR. ERNEST B. KEMPSTER,
分类号
B61L21/06
主分类号
B61L21/06
代理机构
代理人
主权项
地址
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