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经营范围
发明名称
Railway signaling system
摘要
申请公布号
US2341343(A)
申请公布日期
1944.02.08
申请号
US19410405821
申请日期
1941.08.07
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
JR. THOMAS W. TIZZARD,
分类号
B61L23/22
主分类号
B61L23/22
代理机构
代理人
主权项
地址
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