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经营范围
发明名称
Railway drawbridge circuit controller
摘要
申请公布号
US2528064(A)
申请公布日期
1950.10.31
申请号
US19480047102
申请日期
1948.08.31
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
JR. JOHN W. LOGAN,;JEFFERSON GLEN V.
分类号
B61L1/20
主分类号
B61L1/20
代理机构
代理人
主权项
地址
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