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发明名称
Absolute permissive block system of railway signaling
摘要
申请公布号
US2244901(A)
申请公布日期
1941.06.10
申请号
US19400315801
申请日期
1940.01.26
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
STAPLES CRAWFORD E.
分类号
B61L23/16
主分类号
B61L23/16
代理机构
代理人
主权项
地址
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